MEN WHO HAVE GONE ASTRAY FROM THE TRUTH: hoítines peri ten aletheian estochsan (3PAAI): (Mt 22:29; 1Ti 1:19; 6:10,21; Heb 3:10; Jas 5:19)

Men (3748) (hostis) is more literally "The very ones who" including ( Hymenaeus and Philetus).

Wuest notes that hostis and hoítines have...

the two-fold function of pointing out and showing character. It refers back to Hymenaeus and Philetus, “the very ones who are of such a character as to.” The word, Expositors says, “implies that Hymenaeus and Philetus were only the more conspicuous members of a class of false teachers.” (Wuest, K. S. Wuest's Word Studies from the Greek New Testament: Eerdmans) (Bolding added)

Gone astray (795) (astocheo from ástochos = one who misses his aim <> in turn from stóchos = aim, target <> which is from a = negative particle + stoichos (an aim) or stochos - mark) means to miss the mark, deviate from truth: swerve. To err, deviate in a figurative and spiritual sense.

Literally Paul is saying these men

concerning the truth, missed the mark or deviated from the truth.

Astocheo does not mean to miss achieving the aim that one has set, but not to set the proper aim at which one ought to aim. It is not focusing on the right goal instead of not achieving one’s set aim. Naturally if one specializes in the proclamation of something that is not essential and central, he will inevitably neglect that which is central and important. The verb does not mean what is conceived by some as “to fall from grace.”

The false teachers and their followers had clearly demonstrated by their deviation from Apostolic truth that they had left the straight path of sound doctrine. They had deviated from "The Way" an early title for the church. They had deviated from "the Way, the Truth and the Life" (John 14:6) and the result was upheaval of faith for faith comes by hearing (truth) and hearing (truth) equates with the pure milk of the Word of God.

So Paul is saying here are some men who have embraced TRUTH for a while and then gone astray from that TRUTH. This emphasizes Paul's charge for us to be very "diligent...(to handle) accurately the Word of Truth" for clearly it can be mishandled with disastrous consequences.

Note that astocheo is used only by Paul in the NT,  the other two uses being found in the first epistle to Timothy...

For some men, straying from these things (What things? verse 5 ''Instruction'' which is fruitful), have turned aside (astocheo) to fruitless (profitless for their talk produced no godliness. Shakespeare described such babble as “full of sound and fury, signifying nothing.” God said it was ''straw...(not) fire'' in Jer 23:28) discussion (It wasn't that they were missing what they had aimed at, for this verb indicates that their problem was they had not set the proper aim, i.e., instruction which yields spiritual fruit), 7 wanting to be teachers of the Law, even though they do not understand either what they are saying or the matters about which they make confident assertions. (1Timothy 1:7, 8)

O Timothy, guard (see word study on phulasso = aorist imperative) what has been entrusted (placed beside you as a deposit consigned to Timothy for faithful keeping and faith teaching to faithful men who would be able to teach others also) to you, avoiding worldly and empty chatter and the opposing arguments of what is falsely called "knowledge"--21 which some have professed (announced with certainty, asserted respecting themselves) and thus gone astray (astocheo) from "the faith (pistis). Grace be with you. (1Timothy 6:20-21)

SAYING THAT THE RESURRECTION HAS ALREADY TAKEN PLACE: legontes (PAPMPN) ten anastasin êdê gegonenai (RAN): (1Cor 15:12; Col 3:1)

Saying (3004) (lego) means to speak or talk, with an apparent focus upon content of what is said. Present tense indicates that this wasn't a single event but something these men were continually saying.

Resurrection (386) (anastasis [word study] from anístemi = stand up <> ana = up, again + histemi = stand) means to come back to life after having once died and refers most naturally to bodily rising from dead. It is interesting that this is the only use of anastasis in Paul's pastoral letters.

Anastasis - 42x in 42v - Matt 22:23, 28, 30, 31; Mark 12:18, 23; Luke 2:34; 14:14; 20:27, 33, 35f; John 5:29; 11:24, 25; Acts 1:22; 2:31; 4:2, 33; 17:18, 32; 23:6, 8; 24:15, 21; 26:23; Ro 1:4; 6:5; 1 Cor 15:12f, 21, 42; Phil 3:10; 2 Tim 2:18; Heb 6:2; 11:35; 1 Pet 1:3; 3:21; Rev 20:5, 6.

Already (2235) (ede) means now, even now, and in reference to time marks an action as completed.

Taken place (1096) (ginomai) caused to come into being or into existence. The means it had happened at a point in time and the effect or results persisted. It speaks of permanence of this occurrence (with the implication that it won't happen in the future!)

If the resurrection had already taken place, it would give the person who heard and believed this false teaching about the resurrection no hope . It was if they were saying "Forget about the rapture. Paul only meant it symbolically and it was not to be taken literally!".

But in fact Paul had assured the Thessalonian saints  they could maintain a steadfast hope because of a literal bodily resurrection and subsequent rapture writing...

13 But we do not want you to be uninformed, brethren, about those who are asleep, that you may not grieve, as do the rest who have no hope.
14 For if we believe that Jesus died and (literal bodily) rose again, even so God will bring with Him those who have fallen asleep in Jesus.
15 For this we say to you by the word of the Lord, that we who are alive, and remain until the coming of the Lord, shall not precede those who have fallen asleep.
16 For the Lord Himself will descend from heaven with a shout, with the voice of the archangel, and with the trumpet of God; and the dead in Christ shall rise first (literal bodily resurrection)
17 Then we who are alive and remain shall be caught up together with them in the clouds to meet the Lord in the air, and thus we shall always be with the Lord.
18 Therefore comfort one another with these words. (1Th 4:13, 14-note; 1Th 4:15; 16-note; 1Th 4:17; 18-note)

The literal bodily resurrection is at the crux of Christian faith and so Paul had just instructed (present imperative = command) Timothy to be sure to continually...

Remember Jesus Christ risen from the dead (2Ti 2:8-note)

Jesus Himself testified that His resurrection was a bodily and not a spiritual resurrection...

33 And they (Cleopas and a second person on the road to Emmaus with the resurrected Jesus) arose that very hour and returned to Jerusalem, and found gathered together the eleven and those who were with them,
34 saying, "The Lord has really risen, and has appeared to Simon."
35 And they began to relate their experiences on the road and how He was recognized by them in the breaking of the bread.
36 And while they were telling these things, He Himself stood in their midst.
37 But they were startled and frightened and thought that they were seeing a spirit.
38 And He said to them, "Why are you troubled, and why do doubts arise in your hearts?
39 "See My hands and My feet, that it is I Myself; touch Me and see, for a spirit does not have flesh and bones as you see that I have."
40 <And when He had said this, He showed them His hands and His feet.>
41 And while they still could not believe it for joy and were marveling, He said to them, "Have you anything here to eat?"
42 And they gave Him a piece of a broiled fish;
43 and He took it and ate it before them. (Luke 24:33-43)

About 10 years prior to this second and last epistle to Timothy Paul had written to the Corinthian church explaining that...

12 if Christ is preached, that He has been raised (literally, bodily) from the dead, how do some among you say that there is no resurrection of the dead?
13 But if there is no (literal bodily) resurrection of the dead, not even Christ has been raised;
14 and if Christ has not been raised, then our preaching is vain, your faith also is vain (empty, fruitless = There is no true Christian faith without the literal, bodily resurrection, and thus no hope of forgiveness, salvation, or eternal life).
15 Moreover we are even found to be false witnesses of God, because we witnessed against God that He raised Christ, Whom He did not raise, if in fact the dead are not raised (we apostles would all be lying about God for we have said that God raised Christ from the grave, but that can't be true if there is no resurrection of the dead)
16 For if the dead are not raised, not even Christ has been raised;
17 and if Christ has not been raised, (literally, bodily) your faith is worthless; you are still in your sins.
18 Then those also who have fallen asleep in Christ have perished (all who have died believing in Christ have perished)
19 If we have hoped in Christ in this life only, we are of all men most to be pitied.
20 But now Christ has been raised from the dead, the first fruits of those who are asleep (the first of a great harvest of those who will be raised to life again.) (1Cor 15:12-20)

Hiebert explains that Hymenaeus and Philetus...

denied a future bodily resurrection and taught that the only resurrection there was had already occurred in the spiritual renewal of the believer in regeneration. They probably allegorized ("spiritualized") and thus misapplied Paul's teaching about the believer's spiritual union with Christ in death and resurrection

Romans 6:3 Or do you not know that all of us who have been baptized into Christ Jesus have been baptized into His death? 4 Therefore we have been buried with Him through baptism into death, in order that as Christ was raised from the dead through the glory of the Father, so we too might walk in newness of life. 5 For if we have become united with Him in the likeness of His death, certainly we shall be also in the likeness of His resurrection (See notes on Ro 6:1-3 , 6:4-5)

 and insisted that the doctrine of the resurrection had only a spiritual meaning and application.

They allegorized (Ed note: An allegory is a  form of literature in which a story points to a hidden or symbolic parallel meaning) away the doctrine, and turned all into figure and metaphor (Waterland, quoted in Ellicott).

Accepting the current philosophy that matter is evil, they argued that a physical resurrection was unthinkable. (2 Timothy by D. Edmond Hiebert) (Bolding added)

Nelson Study Bible comments that

This was probably an early form of Gnosticism that emphasized a spiritual resurrection over against the Christian belief in a future bodily resurrection. (Radmacher, E. D., Allen, R. B., & House, H. W. The Nelson Study Bible: NKJV.  Nashville: Thomas Nelson)

KJV Bible Commentary agrees writing that...

Resurrection is past. They probably spiritualized the resurrection of the future as the Gnostics of the day taught. (Dobson, E G, Charles Feinberg, E Hindson, Woodrow Kroll, H L. Wilmington: KJV Bible Commentary: Nelson or Logos)

Jamieson, F B writes that...

The beginnings of the subsequent Gnostic heresy already existed. They “wrested” (2Pe 3:16-note) Paul’s own words (Ro 6:4, Ep 2:6, Col 2:12-see notes Ro 6:4; Ep 2:6; Co 2:12) “to their own destruction,” as though the resurrection was merely the spiritual raising of souls from the death of sin. Compare 1Co 15:12, where he shows all our hopes of future glory rest on the literal reality of the resurrection. To believe it past (as the Seleucians or Hermians did, according to Augustine [Epistles, 119.55, To Januarius, 4]), is to deny it in its true sense. (Jamieson, R., Fausset, A. R., Fausset, A. R., Brown, D., & Brown, D. A Commentary, Critical and Explanatory)

Hendriksen comments that Hymenaeus and Philetus...

resembled those present-day liberals who, while refusing to be caught saying, “There is no resurrection,” allegorize (Ed note: An allegory is a  form of literature in which a story points to a hidden or symbolic parallel meaning [Contrast Literal Interpretation]) the concept. Now it must be admitted that Paul, too, believed in a spiritual resurrection, the act of God whereby he imparts the new life to those who are dead in sins and trespasses (Ro 6:3, 4, Ep 2:6, Php 3:11, Col 2:12, Col 3:1-see notes Ro 6:3; 6:4; Ep 2:6; Php 3:11; Col 2:12; Col 3:1; and cf. Lk 15:24). But the apostle also most definitely taught the resurrection of the body (1Co 15; Php 3:21-note), just as Jesus had done (Jn 5:28). According to Paul’s teaching, denial of the bodily resurrection implies the complete overthrow of faith, for “if there is no resurrection of the dead, then Christ has not been raised either; and if Christ has not been raised, then our preaching is in vain, your faith is in vain, … and you are still in your sins” (1Co 15:13, 14, 17)." (Hendriksen, W., & Kistemaker, S. J. New Testament Commentary Set, 12 Volumes. Grand Rapids: Baker Book House) (Bolding added)

Pastor Steven Cole has an interesting sermon on this section noting that...

it is possible to use the Bible to make progress in ungodliness (2Ti 2:14, 16, 17, 18).

Note the words Paul piles up to drive home this frightening point: “useless,” “ruin of the hearers” (2Ti 2:14); “further ungodliness” (2Ti 2:16); “spread like gangrene” (2Ti 2:17); “gone astray from the truth,” “upset the faith of some” (2Ti 2:18). The improper use of the Bible is not an innocent, harmless activity. It leaves a trail of carnage of ruined lives in its wake. That’s one reason James 3:1 warns, “Let not many of you become teachers, my brethren, knowing that as such we shall incur a stricter judgment.” That’s why Paul here warns Timothy to “solemnly charge them in the presence of God” (2Ti 2:14). The Bible is no harmless instrument. It’s a sharp sword and must be handled with proper care....

To use the Bible to teach half-truths as truth is to use it improperly (2Ti 2:18). These men were not totally wrong. They were teaching a half-truth as if it were the whole truth, which is often Satan’s method. They were teaching that the resurrection already had taken place. They had verses from Paul to back up their views. He wrote often of the fact that Christ is risen  and that we are risen with Him. But he also taught that there is a future resurrection of the body, which these men denied. They argued that the resurrection was only spiritual and thus was an accomplished fact.

You  may wonder, “What’s the big deal? Why is this even worth contending about?” Paul answers that question in 1Corinthians 15 where he argues that if there is no future, literal, bodily resurrection, then Christ Himself is not even raised and our faith is worthless

Mark it well: Heresy always begins as truth out of balance! There is always an element of truth in the teachings of the cults. That’s how they get their hooks in people. They even have verses to back up their errors. So they prey on the untaught who are looking for “something more” in their faith. But they lead people away from dependence on the living God. If somebody handed you a three-dollar bill with a picture of Frank Sinatra on it, you wouldn’t be fooled. A counterfeit always looks genuine at first glance. That’s why we have to examine the popular worldly teachings cleverly cloaked with the Bible that are flooding the church in our day. They promote half-truths as if they were the truth of God. (2 Timothy 2:14-19 How To Use The Bible)

AND THUS THEY UPSET THE FAITH OF SOME: kai anatrepousin (3PPAI) ten tinon pistin: (2Ti 2:14; Mt 15:13; Lk 8:13; 22:31,32; Acts 5:39; 1Cor 11:19; 1Jn 2:19)

Upset (396) (anatrepo [word study] from ana = again + trepho = turn) (Click word study of ) means to cause something to be completely overturned. Paul uses the verb figuratively here of the overturning, subverting or overthrowing of the faith of some by corrupting such vital truths (Ro 6:5-note, Col 3:1-note, Col 3:2-note, Col 3:3-note) in addition to denying the encouraging truth of God's promise of the future resurrection when His Son returns for His Bride, the Church (1Th 4:16,17, 18-note).

Anatrepo is in the present tense indicating that these false teachers are continually overthrowing the faith of certain ones.

Anatrepo - 3x in 3v - Jn 2:15; 2Ti 2:18; Titus 1:11 and in 4 verses in the Septuagint - Ps 118:13; Pr 10:3; 21:14; Eccl 12:6.

In his letter to Titus Paul used this same verb describing

"rebellious men, empty talkers and deceivers, especially those of the circumcision who must be silenced because they are upsetting (anatrepo) whole families, teaching things they should not teach, for the sake of sordid gain." (Titus 1:10, 11 - notes)

Faith (4102) (pistis [word study]) means a firm persuasion, conviction or belief in the truth. What Paul is saying is that one's faith can be "destabilized". And what is one way that occurs? Clearly by teaching doctrines of demons, doctrines that use Biblical language and hear even speak of a real Biblical event but which are perverted so that instead of strengthening the faith of the saints, the opposite effect ensues. So what would be the best "antidote" to such toxic teaching? Clearly the Word of Truth, the very entity Paul had just commanded Timothy to be diligent to handle rightly, for Paul knew their would be those who would creep into the body of Christ and subtly, slyly mishandle the Word of Truth.

Paul is referring to genuine saving faith which is not just mental assent but a firm conviction of the veracity of what is heard, a surrender to that truth and a conduct emanating from that surrender. In sum, faith shows itself genuine by a changed life. Stated another way "Don't tell me what you believe. Instead let me watch how you behave, and I'll tell you what you believe! If I watch you long enough, I can tell what you believe by what you do, not by what you say. You can say anything you like, but what you do tells the whole story. And you can watch me and sooner or later, you’ll know what I believe by what I do, regardless of what I say.

Related Resources:

James 2:14-26 Faith that Works!
Relationship of faith and obedience
Fact! Faith! Feeling! - an excellent message from F B Meyer

Wayne Grudem adds that genuine soul saving faith...

William Barclay (see critique) defines "faith" as follows

Faith begins with receptivity. It begins when a man is at least willing to listen to the message of the truth. It goes on to mental assent. A man first hears and then agrees that this is true. But mental assent need not issue in action. Many a man knows very well that something is true, but does not change his actions to meet that knowledge. The final stage is when this mental assent becomes total surrender. In full-fledged faith, a man hears the Christian message, agrees that it is true, and then casts himself upon it in a life of total yieldedness. (Barclay, W: The Daily Study Bible Series, Rev. ed. Philadelphia: The Westminster Press)

Faith means relying on what God has done rather than on one’s own efforts. In the Old Testament, faith is rarely mentioned. The word trust is used frequently, and verbs like believe and rely are used to express the right attitude to God. The classic example is Abraham, whose faith was reckoned as righteousness (Ge15:6).

J. B. Lightfoot discusses the concept of faith in his commentary on Galatians. He notes that in Hebrew, Greek, and Latin, the definition of the word for faith

Remember that although it is not clearly stated in this pastoral epistle, when taken in context with his first letter to Timothy, it is a reasonably good assumption that Timothy was supervising the church at Ephesus. And so here Paul addresses a potentially disturbing situation of false teachers and false teaching with the reminder to Timothy that God was still in control.

Nevertheless (3305) (mentoi) in this context means yet, though, etc, and as such is an adversative (expressing antithesis, opposition, or adverse circumstance). Paul's point is that regardless of the false teachers whose words do not profit, but lead to ruin, ungodliness and upsetting of the faith of some, God is in control and His plans and purposes will not be thwarted! It's as if Paul is saying

Hymenaeus and Philetus may do their false teaching which may spread like cancer and it may even overthrow the faith of some but NEVERTHELESS (sounding a loud note of hope and encouragement)...the firm foundation of God stands

As Edwards phrases it...

The conjunction nevertheless (mentoi) is one which expresses strong contrast. Thus the dismal scenery of man's perversion (2Ti 2:16-18) is now set in contrast with the majestic reality of God's protection and preservation. (Edwards, D: 2Timothy Call to Completion)

Ray Pritchard (2 Timothy 2:14-16: The Life God Blesses) has an interesting comment on "nevertheless" writing that...even in days of moral decline, the Lord says to us, “Nevertheless.”

Do false teachers seem to abound?
The Lord says, “Nevertheless.”

Are perilous times upon us?
The Lord says, “Nevertheless.”

Do we fear for the future?
The Lord says, “Nevertheless.”

Are we worried for our children’s safety?
The Lord says, “Nevertheless.”

Do we wonder how the church will survive?
The Lord says, “Nevertheless.”

Do we see some falling away from the faith?
The Lord says, “Nevertheless.”

Are we tempted to despair?
The Lord says, “Nevertheless.”

Could persecution come to us?
The Lord says, “Nevertheless.”

Do evildoers rise to power?
The Lord says, “Nevertheless.”

Firm (4731) (stereos) means that which is solid or firm in contrast with that which is soft or liquid. It means stable and immovable. Paul's point is that regardless of how one specifically interprets the phrase "firm foundation" deviation from sound doctrine, while serious, will not hamper God purposes.

Guthrie writes that...

In the statement, God's solid foundation stands firm, the emphasis falls on the immovable character of God's foundation. It is never in doubt. It forms a vivid contrast to the defection which the false teachers represent. (Guthrie, D: 2 Timothy)

Foundation (2310) (themelios from théma = that which is laid down <> from títhemi = to place) something put down, a substructure (of a building) or that on which a structure is built.

Spurgeon says regarding the firm foundation that...

There is no moving that. Whether ten thousand oppose it or promulgate it, the truth is still the same in every jot and tittle; even as the sun shineth evermore, as well when clouds conceal its brightness as when from a clear sky it pours abroad a flood of glory. The lovers of profane and vain babblings have not taken away from us, nor can they take from us, the eternal verities: the Lord liveth, though they have said, "There is no God." The precious blood of Jesus has not lost its efficacy, though divines have beclouded the atonement; the Spirit of God is not less mighty to quicken and to console though men have denied his personality; the resurrection is as sure as if Hymenaeus and Philetus had never said that it is passed already; and the eternal covenant of grace abides for ever unbroken though Pharisees and Sadducees unite to revile it. The foundation of God standeth sure.

All that God has built upon the foundation which He Himself has laid keeps its place, not one living stone that he ever laid upon the foundation has been lifted from its resting place. Earthquakes of error may test the stability of the building and cause great searching of heart, but sooner shall the mountains which are round about Jerusalem start from their seats than the work or word of the Lord be frustrated. The things which cannot be shaken remain unaltered in the very worst times. (from 2 Timothy 2:20,21 The Great House and the Vessels)

Stands (2476) (histemi) means in this context that it is established. The perfect tense indicates the permanence of this foundation and more literally could be translated "has stood with the present result that it stands permanently." If we keep our focus where it should be, we will never have our faith overthrown!

Edwards comments that the perfect tense emphasizes...

the continual state of standing sure. Though men have tried to dismantle and destroy the true church for 2,000 years, God has sovereignly upheld and even multiplied it ever since its inception. Not surprisingly this is in accord with Christ's promise and prophecy in Matthew 16:18 (Jesus speaking "And I also say to you that you are Peter, and upon this rock I will build My church; and the gates of Hades shall not overpower (prevail, vanquish, gain mastery over) it.") .  (Edwards, D: 2 Timothy Call to Completion)

The firm foundation. What does this phrase refer to? The two most frequently mentioned interpretations are (1) the church composed of genuine believers or (2) the Lord Jesus Christ, the Solid Rock upon which the church rests. To an extent these two possibilities are virtually impossible to separate for the church is composed of those who are members of His flesh and one flesh with Him. As Paul explained the

church...is His body, (and is) the fulness of Him who fills all in all." (see notes Ephesians 1:22; 1:23)

In his first letter to Timothy Paul described

"the household of God, which is the church of the living God, the pillar and support (prop, stay, support) of the truth." (1Ti 3:15)

The idea would then be that the church is the pillar, and as such, the prop or support of the truth, even in face of those whose empty chatter that might upset the faith of some.

Pritchard comments that...

God is still in control because the “solid foundation” stands firm. God’s church is built on the solid Rock—Jesus Christ our Lord. He is the cornerstone of our faith. The church will not fail because it rests on the eternal promises of God Who cannot lie and will not be defeated. Fear not, child of God. Do not give in to despair. God is still on the throne. He knows His own and He will not let them utterly fall. Rough times may come, but God does not forget His children. They are safe in His hands even when the waves of turmoil and clouds of compromise seem to temporarily blot out the sun. The Lord is on the throne and He will not be moved. Those who trust in Him will be safe forever. (2 Timothy 2:14-16: The Life God Blesses) (Bolding added)

Edwards commenting on the meaning of "firm foundation" writes that

This question has been much disputed, and several explanations have been proposed. Prominent among these are: Christ and the apostles (Ep2:20); the truth of the gospel; or, the church (1Ti3:15). While not wanting to be dogmatic, my personal preference is for the church. In spite of the collapse of some members of the church (verse 18), the church itself remains firm. (Edwards, D: 2 Timothy Call to Completion)

Hiebert writes that

God demands separation from unrighteousness of His own, as Paul at once points out. The mention of the subversion of the faith of some (in the preceding verses) does not mean that God's true Church can be destroyed. "Howbeit [or nevertheless] the firm foundation of God standeth." The cause of truth rests upon God's "firm foundation" which continues to stand in spite of the attacks of error and unbelief. The foundation is described as "firm" or "solid" in its nature, hence permanent and stable. The significance of the foundation has been variously interpreted. The context points to the meaning of the foundation as the whole body of genuine believers, the true Church of God built upon the apostolic doctrine.  (D. Edmond Hiebert: 2 Timothy) (Bolding added)

Wuest comments that

"Paul has been speaking of the true Church, the Mystical Body of Christ made up of believers only. In this verse he is referring to the visible organized Church on earth, made up of saved and unsaved. Vincent says:

“But the Church embraces a variety of characters. Unrighteous men steal into it. So in a great household establishment there are vessels fit only for base uses.” (Wuest, K. S. Wuest's Word Studies from the Greek New Testament: Eerdmans) (Bolding added)

Jameison, Fausset and Brown also favor the

"foundation here is “the Church”, which is “the ground” or basement support “of the truth” as in (1Ti 3:15), but he Christ Himself being the ultimate “foundation” (1Cor 3:11).

Steven Cole feels...

The foundation refers to the true people of God, the church. Those who truly belong to the Lord are not carried away by false teaching. The seal on the foundation, or cornerstone, has two statements that reflect two important aspects of our salvation. These two statements come from the story of Korah’s rebellion against Moses. Moses said (Num. 16:5), “the Lord will show who is His, and who is holy, and will bring him near to Himself; even the one whom He will choose….” He warned the congregation to de-part from the tents of these wicked men before God destroyed them (Nu 16:26)

Paul says that the first part of the seal is, “The Lord knows those who are His.” Salvation does not begin with man; it begins with God. He planned it and He executed it. “He chose us in [Christ] before the foundation of the world” (Ephesians 1:4 - note). “In the exercise of His will He brought us forth by the word of truth” (James 1:18). We can’t know God’s truth until God has first laid hold of us and saved us from our sins by His grace alone.

The second statement is, “Everyone who names the name of the Lord is to abstain from wickedness.” As Ephesians 1:4 (note) continues, God chose us “that we would be holy and blameless before Him.” We can be assured that we belong to the Lord because we see Him progressively working His holiness into our daily lives. So the foundation for using the Bible properly is that God knows us as His own and that through our diligent, careful study and application of His Word of truth, we are growing in godliness. (Ibid)

Through His prophet Isaiah, Jehovah declares

"Behold, I am laying in Zion a stone, a tested stone, a costly cornerstone for the foundation, firmly placed. He who believes in it will not be disturbed." (Isa 28:16)

In a clear prophecy of the Messiah, God declares that He has established Messiah as the only One worthy of trust and that He Alone is a firm foundation. Those who rely on Him never need be fearful even though false teachers may upset the faith of some.

Although some stones might be removed, a foundation or cornerstone would remain secure. Unlike those who trust in a false teachers and false religions, those who are truly saved, who are God’s spiritual children and genuine disciples of Jesus Christ, are part of the firm foundation of God. Jesus promised that if a house (equated with one's religious life) was built upon the rock, it would not fall even though

the rain descended, and the floods came, and the winds blew, and burst against that house... for it had been founded upon the rock." (see note Matthew 7:25)

This firm foundation could be a reference to Christ Jesus and His apostles for Paul writes that

the saints, and are of God’s household, having been built upon the foundation of the apostles and prophets, Christ Jesus Himself being the corner stone. (see note Ephesians 2:20). 

In a parallel passage using this same metaphor Paul writes to the Corinthians that

According to the grace (the special endowment for my task) of God which was given to me, as a wise master builder (skillful architect) I laid a foundation, and another is building upon it. But let each man be careful how he builds upon it. For no man can lay a foundation other than the one which is laid, which is Jesus Christ. (1Cor 3:10-11)

All empty chatter, human philosophy, religious systems or ethical codes are doomed to failure and destruction, because they lack a firm foundation. There is only one foundation, and, no matter how one may try, no man can lay a foundation other than the one which has already been laid, which is Jesus Christ. God’s kingdom is built on Jesus Christ, and every individual life that pleases God must be carefully built on that foundation.

Vine writes that...

No matter how great the apostasy from the faith, no matter how subversive the work of false teachers, God’s foundation stands in its impregnable character. (Vine, W. Collected writings of W. E. Vine. Nashville: Thomas Nelson or Logos)

Solomon records that

When the whirlwind passes, the wicked is no more, but the righteous has an everlasting foundation. (Hebrew = a base on which people build structures) (Pr 10:25).

Symbolically, the Hebrew word for "foundation" refers to principles on which people build their lives, whether they be faulty or sound.

HAVING THIS SEAL: echon (PAPMSN) ten sphragida tauten: (Hag 2:23; Zech 3:9; 4:7-9; Eph 4:30-note)

Having (2192) (echo) is in the present tense indicating that the foundation continually has this seal.

Seal (4973) (sphragis) (Click for an excellent article on "seal" in ISBE) is an engraved object used to make a mark denoting ownership, approval, or closure of something. It was normally done by pressing into heated wax and usually attached to a document or letter as a seal or signet. Thus sphragis often referred to the signet ring itself. MacArthur adds that

Kings or other officials would use such rings to stamp into wax on documents or other items, thereby affirming their authenticity and guaranteeing their security (cf. Ge 41:42; Esther 3:10; 8:2, 8; Da 6:17; Mt 27:66)  A seal thus denoted ownership and protection (cf. Jn 6:27; 2Co 1:22; Ep 1:13-note; Ep 4:30-note). (Revelation 1-11. 1999. . Chicago: Moody Press)

A seal thus could indicate authority and would protect or at least warn against tampering with that which was sealed, which was one purpose that the tomb of Jesus was sealed (Mt 27:66). Seals were also used on documents or merchandise to validate that they had not been tampered with. A seal could authenticate a legal decree or other document, certifying and guaranteeing its genuine character.

A seal indicated the structure’s authenticity and integrity (cf. Ro 4:11-note; 1Cor 9:2) and in context of 2 Timothy chapter 2, assures the believer's ownership, authentication, protection, security and destination.  In the metaphor of a building as in this passage, the seal would represent the inscription on the cornerstone as inscribed by the owner or builder of the building.

NIDNTT in a thorough discussion of seal (both the noun and verb) writes that...

The noun means both the tool that seals (e.g. a signet ring), the stone set in it (the gem) and the engraving on it (an image or name) as well as its imprint.

Seals were widely used very early (3rd millennium onwards), especially in Mesopotamia, where Hdt. observed that every man possessed not only a staff but also a seal (1, 195), and later in the whole Mediterranean area (on the different forms of seals-e.g. rolls, buttons, scaraboid-cf. BHHW III 1786 ff., 1812 f.). The real importance of the seal is a legal one: the owner puts his mark on his possessions, his beasts (cf. Virgil, Georgics 3, 157 ff.; BGU I, 87, 12 f.; P. Teb. 419), his slaves (cf. Pliny, Nat. Hist. 25, 13, 173; BGU I, 15, etc.) and thereby guards his property against theft. To that extent one can call it a protecting sign or a guarantee. When used with documents (wills, deeds of sale, etc.) the seal served as a signature to authorize what was written there (cf. TDNT VII 941). Things sealed were at the disposal of the possessor of the seal. This applied not only to private persons, but also particularly to the authorities of a city and to kings. The seal symbolized their authority.

Seals were also significant in religious life. For instance, a beast could be attested as ritually pure and thus suitable for a sacrificial victim (cf. Hdt. 2, 38; BGU, I, 250, 15 ff.; 356, 7). Men show themselves to be the possession of their deity by the imprint of their seal (Hdt., 2, 113; cf. 3 Macc. 2:29f.; also J. Ysebaert, Greek Baptismal Terminology, 1962, 200 f.). More tangibly one can seal houses, etc., to guarantee that they were preserved, or documents, to keep their contents a secret. Hence, one can also say that the mouth or words are sealed (cf. Diog. Laert., 1, 58; Theognis, 1, 178; Timotheus, Persians 148): what one has experienced must remain secret and in safe keeping. This applied particularly to keeping the secrets of the mysteries (Ysebaert, op. cit., 221-226).

A seal engraved by a maker of signets (Sir. 38:27) can leave its impress in clay (Job 38:14). It has a legal use: by means of a seal a document (e.g. a marriage contract, Tob. 7:14; or a deed of sale, Jer. 39:10f., 44 [32:10f., 44]) is made valid. All who affix their seals to a document are bound to abide by its contents (Neh. 10:1). To give one’s seal to another implies the transference of authority and power (Gen. 41:42; 1 Ki. 20:8 or LXX 1 Ki 21:8; Est. 3:10; 8:8, 10). Hence, one of the means by which the dying Antiochus Epiphanes appointed his friend Philip as regent over his kingdom was to hand over his seal to him (1 Macc. 6:15).

The LXX can also speak of a seal used as a fastening (for a purse, 2 Ki. 22:4; Tob. 9:5; a treasury, Deut. 32:34; the temple, Ad.Dan. 14:14, 16f.; a pit, Dan. 6:18; a fountain, Cant. 4:12). Thence the act of sealing comes to be equivalent to keeping something secret: that which is sealed is hidden from men (a book, Dan. 12:4; Isa. 29:11; cf. 1 Esd. 3:8). The seal is thus absolutely necessary in both private and public life. The seal of the state (Jerusalem, 2 Esd. 10:23) is carefully guarded (Tob. 1:22). Signet-rings are precious (Isa. 3:20; Sir. 35:5f. [32:5f.]) and are regarded as valuable spoil (Num. 31:50).

The figurative use of the concept is found especially with the sense of concluding or shutting up...A revelation that is sealed remains hidden (Dan. 12:9) and one can therefore learn as little of its contents as of those of a sealed book. In Job 24:16 skulking malefactors are said to have “sealed” themselves from daylight. (Brown, Colin, Editor. New International Dictionary of NT Theology. 1986. Zondervan) 

Here are the 16 NT uses of sphragis...

Romans 4:11 (note) and he received the sign of circumcision, a seal of the righteousness of the faith which he had while uncircumcised, that he might be the father of all who believe without being circumcised, that righteousness might be reckoned to them,

1 Corinthians 9:2 If to others I am not an apostle, at least I am to you; for you are the seal of my apostleship in the Lord.

2 Timothy 2:19 (note)  Nevertheless, the firm foundation of God stands, having this seal, "The Lord knows those who are His," and, "Let everyone who names the name of the Lord abstain from wickedness."

Revelation 5:1 (note) And I saw in the right hand of Him who sat on the throne a book written inside and on the back, sealed up with seven seals.

Revelation 5:2 (note) And I saw a strong angel proclaiming with a loud voice, "Who is worthy to open the book and to break its seals?"

Revelation 5:5 (note) and one of the elders said to me, "Stop weeping; behold, the Lion that is from the tribe of Judah, the Root of David, has overcome so as to open the book and its seven seals."

Revelation 5:9 (note) And they sang a new song, saying, "Worthy art Thou to take the book, and to break its seals; for Thou wast slain, and didst purchase for God with Thy blood men from every tribe and tongue and people and nation.

Revelation 6:1 (note) And I saw when the Lamb broke one of the seven seals, and I heard one of the four living creatures saying as with a voice of thunder, "Come."

Revelation 6:3 (note) And when He broke the second seal, I heard the second living creature saying, "Come."

Revelation 6:5 (note) And when He broke the third seal, I heard the third living creature saying, "Come." And I looked, and behold, a black horse; and he who sat on it had a pair of scales in his hand.

Revelation 6:7 (note)  And when He broke the fourth seal, I heard the voice of the fourth living creature saying, "Come."

Revelation 6:9 (note) And when He broke the fifth seal, I saw underneath the altar the souls of those who had been slain because of the word of God, and because of the testimony which they had maintained;

Revelation 6:12 (note)  And I looked when He broke the sixth seal, and there was a great earthquake; and the sun became black as sackcloth made of hair, and the whole moon became like blood;

Revelation 7:2 (note)  And I saw another angel ascending from the rising of the sun, having the seal of the living God; and he cried out with a loud voice to the four angels to whom it was granted to harm the earth and the sea,

Revelation 8:1 (note) And when He broke the seventh seal, there was silence in heaven for about half an hour.

Revelation 9:4 (note)  And they were told that they should not hurt the grass of the earth, nor any green thing, nor any tree, but only the men who do not have the seal of God on their foreheads.

Sphragis is used 10 times in the LXX (Ex 28:11, 21, 36; 35:22; 39:6, 14, 30; 1 Ki. 21:8; Song 8:6; Hag. 2:23)

The New Manners & Customs of the Bible has the following note

The allusion here is to inscriptions that were placed on buildings. Besides writing on doors (see Deuteronomy 6:9 Doorposts Inscriptions), it was customary to inscribe on some of the foundation stones of large buildings words indicating the purpose for which the building was erected, or containing some striking maxim. (Freeman, J. M., & Chadwick, H. J.  The New Manners & Customs of the Bible. Page 544)

Hiebert writes that

Paul pictures God's firm foundation as having a two­fold "seal." The figure is not that of an "inscription" on a building, although many scholars advocate this picture. The seal was used to indicate ownership, security, and authenticity. Here the seal with its two legends speaks of ownership, security, and authenticity, certifying the genuineness of those thus sealed. The seal with which believers are sealed indicates divine ownership, proclaims their security, and guarantees their genuineness.

This seal has two complementary readings: "The Lord knoweth them that are his: and, Let every one that nameth the name of the Lord depart from unrighteousness." To be valid, the two legends on the seal cannot be separated. (Ed note: or otherwise the seal would not be viewed as "intact") The first emphasizes the objective fact of God's superintending knowledge of His own; the second stresses the need for man's holiness. The first is dated in eternity past; the second regulates the believer's present conduct. The first assures the security of the Church; the second requires its purity. The first is a truth to be believed; the second is a demand to be obeyed. (D. Edmond Hiebert: 2 Timothy) (Bolding added)

White agrees writing that...

The one seal bears two inscriptions, two mutually complementary parts or aspects: (a) The objective fact of God's superintending knowledge of His chosen; (b) the recognition by the consciousness of each individual of the relation in which he stands to God, with its imperative call to holiness (As quoted in Expositor's Bible Commentary 6-Volume New Testament. Zondervan Publishing)) (Bolding added)

Hendriksen adds that

The seal by which believers are sealed protects, indicates ownership, and certifies, all three in one! Cf. Rev7:2–4. God the Father protects them, so that none are lost. He has known them as His own from all eternity (the context calls for this idea). God the Son owns them. They were given to Him. Moreover, He bought or redeemed them with His precious blood. This idea of ownership is clearly expressed here (“the Lord knows those who are his”). And God the Holy Spirit certifies that they are, indeed, the sons of God (Ro8:16). This divine protection, ownership, and certification seals them! But how do believers experience the comfort of the seal? The answer is: by taking to heart what is written on the seal! (Hendriksen, W., & Kistemaker, S. J. New Testament Commentary Set, 12 Volumes. Grand Rapids: Baker Book House)

Barclay writes...

the sphragis (seal) was the architect's mark. Always on a monument or a statue or a building the architect put his mark, to show that he was responsible for its design. The sphragis can also be the inscription which indicates the purpose for which a building has been built. (Barclay, W: The Daily Study Bible Series, Rev. ed. Philadelphia: The Westminster Press)

Vincent puts the matter this way,

 There are two inscriptions on the foundation stone, the one guaranteeing the security, the other the purity... . The two go together. The purity... is indispensable to its security. (Vincent, M:  Word studies in the New Testament Vol. 4, Page 303-304).

THE LORD KNOWS THOSE WHO ARE HIS: Egno (3SAAI) kurios tous ontas (PAPMPA) autou: (Nu 16:5; Ps 1:6; 37:18,28; Na 1:7; Mt 7:23; Lk 13:27; Jn 10:14; Jn 10:27, 28, 29, 30; 13:18; Ro 8:28; 11:2; 1Cor 8:3; Gal 4:9; Rev 17:8)

Numbers 16:5 (See discussion below) and he (Moses) spoke to Korah and all his company, saying, "Tomorrow morning the LORD will show who is His, and who is holy, and will bring him near to Himself; even the one whom He will choose, He will bring near to Himself. (Comment: And indeed Jehovah did show who was His, as the way of the ungodly perished!)

Psalms 1:6 For the LORD knows the way of the righteous, but (note the striking contrast) the way of the wicked will perish (Comment: the implication in this verse of Jehovah "knowing" men, is that those men will not perish, so the "knowing" speaks of a personal relationship, and ultimately from other passages is a relationship based on grace through faith)

Ps 37:18 The LORD knows the days of the blameless; and their inheritance will be forever...20 But  (note the striking contrast) the wicked will perish; And the enemies of the LORD will be like the glory of the pastures, They vanish-- like smoke they vanish away. (The Psalmist encourages the godly and seeks to warn the ungodly)

Ps 37:28 For the LORD loves justice, And does not forsake His godly ones; They are preserved forever; but (vivid contrast) the descendants of the wicked will be cut off.

Nahum 1:7 (In the midst of a section describing God's judgment, Nahum records these marvelous words of compassion) The LORD is good, A stronghold in the day of trouble, And He knows (LXX = ginosko) those who take refuge in Him (from the above passages, only the blameless and righteous will take refuge in Him).

Knows (1097) (ginosko) has the basic meaning of taking in knowledge in regard to something or someone, knowledge that goes beyond the merely factual (study the above passages for some insights into what God knowing a man signifies!). By extension, the term frequently was used of a special relationship between the person who knows and the object of the knowledge. It was often used of the intimate relationship between husband and wife and between God and His people.

Notice that believers may not always know who in the church body (local and mystical) are genuine born again believers but God knows. Jesus explained in the parable of the wheat and tares (Matthew 13:24, 25, 26, 27, 28, 29, 30, 36-43) that the kingdom of heaven on this present earth (He was referring to the world -- the field is the world-- not the church as is often taught, although the principle is of course applicable to the church) is composed of good seed (sons of the kingdom) and bad seed (sons of the evil one) and that although it may difficult for true believers to differentiate false "believers", the Son of Man knows who they are and will send His angels to gather them out of His kingdom and cast them into hell.

Although we cannot necessarily discern a "pseudo-believer", we can each be assured and certain of our salvation for as Paul explains the..

The Spirit Himself bears witness with (present tense) (this Greek verb is found in secular writing where the signature of each attesting witness is accompanied by the words "I bear witness with and "I seal with") our spirit that we are children of God (Ro 8:16-note)

Jesus affirmed

I am the good (worthy, choice, excellent) shepherd; and I know (ginosko - recognize) My own, and My own know (ginosko - recognize) Me (Jn 10:14).

Jesus goes on to add that

My sheep hear My voice, and I know (ginosko) them, and they follow Me and I give eternal life to them, and they shall never perish; and no one shall snatch them out of My hand. “My Father, Who has given them to Me, is greater than all; and no one is able to snatch them out of the Father’s hand. (Jn 10:27, 28, 29).

Here Jesus speaks of the intimate, safe and secure ("sealed") relationship that exists between Himself and His sheep (disciples). They can never be lost!

On the other hand Jesus will declare to the wicked

I never (absolute, complete negation - in other words, they did not "lose" salvation {which the Bible does not teach} - they simply never had it) knew (ginosko) you, depart (aorist imperative of the verb apochoreo = move away from, with emphasis upon separation) from Me, you who practice (present tense   = habitually or as your lifestyle, in contrast to occasion "slip ups" even believers make) lawlessness. (sin, iniquity, unrighteousness)" (Mt 7:23-note).

From a practical viewpoint, lawlessness...

...is living as though your own ideas are superior to God's.
...says, "God may demand it but I don't prefer it."
...says, "God may promise it but I don't want it."
...replaces God's law with my contrary desires. I become a law to myself.
...is rebellion against the right of God to make laws and govern His creatures.

In a parallel passage in Jesus answers the question concerning who would be saved by declaring

"Strive to enter by the narrow door; for many, I tell you, will seek to enter and will not be able." He goes on to explain that "Once the head of the house gets up and shuts the door, and you begin to stand outside and knock on the door, saying, ‘Lord, open up to us!’ then He will answer and say to you, ‘I do not know where you are from.’ “Then you will begin to say, ‘We ate and drank in Your presence, and You taught in our streets’; and He will say, ‘I tell you, I do not know where you are from; depart from Me, all you evildoers.’ “There will be weeping and gnashing of teeth there when you see Abraham and Isaac and Jacob and all the prophets in the kingdom of God, but yourselves being cast out." (Lk 13:24, 25, 26, 27, 28).

God knows who are His and this is a firm foundation. Sitting in church does not make you a Christian anymore than sitting in a garage does not make you a car! You might be reading these notes and thinking

I belong to the Lord. I know I am His. I am going to heaven. Who cares about this sin issue? After all I'm in because I have the best 'fire insurance' policy one can possess!

Dear friend, if you think this way, you have missed Paul's point that there is a seal that affixes inseparably two firm and foundational Biblical truths, and the second truth is that those who are His are to exhibit a lifestyle manifest by a desire to depart from iniquity. If you lack any desire to depart from iniquity then you must seriously examine the authenticity and validity of your "fire insurance policy"! You may be deceiving yourself and this is a deception you don't want to wake up from after your last breath on earth and tragically discover yourself in hell rather than heaven.

Those who are His speaks of an intimacy, as between a father and a son. A son of God who possesses the energizing power and presence of the Holy Spirit of God will desire to be pleasing to his Father and to give a proper impression of his Father by the way he lives before a watching world.

Ray Pritchard writes that...

It would be easy and perhaps even tempting to give in to despair. This verse reminds us that the church does not belong to us, it belongs to God, and even in the worst times, the Lord knows his own children. The inscription written at the base of the house of the Lord says, “The Lord knows those who are his.” They are his by the miracle of regeneration, they partake in his divine nature, and they show forth his family likeness. The Lord is not fooled one bit by the false teachers who claim to be part of his family but are not. As a true Father, He knows His children and He calls them by name. If you take my three sons and put them in a crowded auditorium, I can pick out Josh, Mark and Nick immediately. I know what they look like, I know their voices, and I probably even know what they are up to. I know them through and through. If I know my own sons, is it any surprise that the Lord knows His own children the same way? (2 Timothy 2:14-16: The Life God Blesses)

D. Edmond Hiebert comments that "knows" is more literally translated "knew" because...

the aorist tense takes us back into eternity when this seal was affixed once for all with present historical validity. By virtue of His sovereign grace, He foreknew them as His own. But the security of those thus known by God is not an arbitrary or mechanical matter. To those divinely sealed as known by God the second part of the seal also applies. To name "the name of the Lord" is to make a profession of belief in His claims, to acknowledge oneself as a believer. Of such God demands that they "depart from unrighteousness." The second legend is not merely an appended admonition or warning; it is an integral part of the seal. True trust in God for security must reveal itself in a life of effective separation from unrighteousness. This is God's demand upon and the characteristic of those who constitute the foundation of God. (D. Edmond Hiebert: 2 Timothy)

Barnes adds that this inscription

"always stands there, no matter who apostatizes. It is at the same time a fearful inscription - showing that no one can deceive God; that he is intimately acquainted with all who enter that building; and that in the multitudes which enter there, the friends and the foes of God are intimately known. He can separate his own friends from all others, and his constant care will be extended to all who are truly his own, to keep them from falling." (Barnes Notes on the NT)

This verse appears to come from Numbers where Moses was confronted by Korah and his rebel band, and responded by saying

"to Korah and all his company... “Tomorrow morning the Lord will show who is His, and who is holy, and will bring him near to Himself; even the one whom He will choose, He will bring near to Himself." (Nu 16:5)

The Septuagint (LXX, Greek of the Hebrew OT) reads "egno ho theos tous ontas autou", which is virtually identical to Paul's phrase in the Greek in 2Ti 2:19.

So just as God knew Aaron and Moses were His (leaders), He also knew that Korah and his rebel band were not His and as everyone knows the earth opened up and swallowed them alive, proving He did not "know" them! The point of this passages is that God differentiates between His faithful servants and those who are unfaithful.

AND LET EVERYONE WHO NAMES THE NAME OF THE LORD: pas o onomazon (PAPMSN) to onoma kuriou: (Nu 6:27; Ps 97:10; Isa 63:19; 65:15; Mt 28:19; Acts 9:14; 11:26; 15:17; Ro 15:9,20; 1Cor 1:2; Eph 3:15; Rev 2:13; 3:8; 22:4)

Everyone who names the name of the Lord - This is "long hand" for those who profess Christ as Lord.  Profession of Christ as Lord shows itself to be a genuine possession of Him as one's life by a changed life. Truth believed transforms (cp 2Co 5:17). In other words, I can tell what you believe by what you do, not by what you say. You can name the Name of "Jesus", but what you do speaks loudly what you really believe about that Name.

Names (3687) (onomazo) means to give a name or bear the name of (in this case of the Lord).

Onomazo is in the present tense depicts these individuals as continually naming the name of the Lord Jesus Christ...some may name Him one day or for a season, only to fall away when persecution arises or they are choked by the worries, pleasures and riches of the world (Mk 4:19, Lu 8:14). A true believer will never (irrevocably) deny His Name. So one who names Him continually is one who does not deny Him.

ABSTAIN FROM WICKEDNESS: kai aposteto (3SAMM) apo adikias: (Job 28:28; Ps 34:14; 37:27; Pr 3:7; Ro 12:9; 2Co 7:1; Ep 4:17, 18, 19, 20, 21 22; Ep 5:1-11; Col 3:5, 6, 7, 8; Titus 2:11, 12, 13, 14; 1Pe 1:13, 14, 15, 16, 17, 18, 19; 2Pe 1:4, 5, 6, 7, 8, 9, 10; 3:14; 1Jn 3:7, 8, 9, 10)

Abstain (868) (aphistemi from apo = separation of one thing from another + histemi = stand) literally means to stand off from (English = apostasy) means to withdraw, forsake, depart from or remove oneself from.

Abstain is aorist imperative which is an almost "military like" command calling for urgent action to depart from wickedness.

The Holman Bible has an interesting translation

"Everyone who names the name of the Lord must turn away from unrighteousness."

The Holman New Testament Commentary adds that

"Only God know the inward working of the heart, but everyone who confesses the name of the Lord will evidence increasing godliness-- they must turn away from wickedness. Both inward and outward change are necessary components of a true believer in Jesus Christ. Timothy might have difficulty discerning the faithful from the faithless, but God cannot be fooled. He knows those who belong to Him."

Wickedness (93) (adikia [word study] from a = not + dike = right) means unrighteousness, a condition of not being right, whether with God, according to the standard of His holiness and righteousness or with man, according to the standard of what man knows to be right by his conscience.

There are many who profess they are ''Christian'' ("those who are His") but who live wicked lives (fail to "abstain from wickedness" cp 1Pe 2:11-note). So Paul is saying back up your "God talk" with a "holy walk". A "holy walk" won't save you, but it will demonstrate to yourself and others that you are genuinely saved.

If we claim to be the Lord’s, naming the name of Christ, we are to “abstain from wickedness” ...we can see who we are His by the quality of our lives, or in Jesus’ words, by the fruit that we bear...

"Either make the tree good, and its fruit good; or make the tree bad, and its fruit bad; for the tree is known by its fruit." (Mt 12:33)

Henry Morris writes that

"In the church, built upon God's true foundation (Christ and His Word), the Lord identifies those who belong to Him as those who believe on the name of Christ and, therefore, depart from iniquity." (Morris, Henry: Defenders Study Bible. World Publishing)

Disciple's Study Bible agrees that

"Genuine confession will be accompanied by forsaking wickedness." (Disciple's Study Bible)

Matthew Henry writes that

"If the name of Christ be called upon us, we must depart from iniquity, else he will not own us."

Ray Pritchard illustrates the importance of Paul's command to abstain from wickedness noting that...

We live in days of enormous moral, spiritual and cultural confusion. Long-held tenets of proper moral behavior are increasingly doubted and even denied. And the trends in society have made their presence felt in the church. Just this morning I read where the Archbishop of Canterbury is wondering what God is saying to the Church of England after a homosexual minister who had been appointed as a bishop withdrew from the position. Well, let’s see. We know what God says about homosexuality. It’s condemned every time it is mentioned in the Bible. So God’s Word is perfectly clear. That’s not the problem. What could God be saying to the Anglican Church through this fiasco? How about this? ”Don’t appoint homosexual bishops,” and maybe even, “It’s time to take my Word seriously.” I don’t think that’s exactly what the Archbishop had in mind, however. The greater point is that the modern-day followers of Hymenaeus and Philetus seem to be everywhere in the world. They claim to be Christians, they claim to be following the Lord, they claim to be true to the faith, but by their words and by their deeds, they deny the very truth they claim to uphold.

The second inscription reminds us that what God knows on the inside may be clearly seen on the outside:

“Everyone who confesses the name of the Lord must turn away from wickedness.”

Here is an infallible test to help you spot false teachers. If a so-called Christian minister promotes that which God calls wickedness, you may be sure that he is no true follower of the Lord. God’s children are called to moral purity. They are called to depart from the wickedness of the world. The Lord knows who truly belongs to Him, and we may see the same thing (though not as perfectly) by the moral choices of those who claim to be following Jesus. In the end, the children of God will never be comfortable living in sin. They are called to something higher and better, and deep inside, they truly want to please the Lord and they want to depart from wickedness. (2 Timothy 2:14-16: The Life God Blesses) (Bolding added)

John Wesley  adds that

"Indeed, they only are his who depart from iniquity. To all others he will say, "I know you not." (Mt 7:23-note)."

John and Charles Wesley thought they were "holy" men but it was not until conversion over 10 years after forming their famous "Holy Club" that they truly became set apart by God & for God. The chronology of John's conversion is summarized:

1726 "Holy" Club began but despite their "holy" behavior they were not yet born again.
1735 John & Charles sailed to America to convert the Indians but John & Charles themselves were not converted! 
1738  John describes his genuine conversion

In the evening, I went very unwillingly to a Society in Aldersgate-Street, where one was reading Luther’s preface to the Epistle to the Romans. About a quarter before nine, while he was describing the change which God works in the heart through faith in Christ, I felt my heart strangely warmed. I felt I did trust in Christ; Christ alone, for salvation; and an assurance was given me, that he had taken away my sins, even mine, and saved me from the law of sin and death.

C H Spurgeon in Morning and Evening has the following devotional on "The foundation of God standeth sure." 2 Timothy 2:19