Webster defines "conscience" as the sense or consciousness of the moral goodness or blameworthiness of one’s own conduct, intentions, or character together with a feeling of obligation to do right or be good.

The Greek noun suneidesis is the exact counterpart of the Latin con-science, “a knowing with,” a shared or joint knowledge. It is our awareness of ourselves in all the relationships of life, especially ethical relationships. We have ideas of right and wrong; and when we perceive their truth and claims on us, and will not obey, our souls are at war with themselves and with the law of God

Suneidesis is that process of thought which distinguishes what it considers morally good or bad, commending the good, condemning the bad, and so prompting to do the former and avoid the latter.

To have a "clear conscience" does not mean that we have never sinned or do not commit acts of sin. Rather, it means that the underlying direction and motive of life is to obey and please God, so that acts of sin are habitually recognized as such and faced before God (1Jn 1:9)

A "clear conscience" consists in being able to say that there is no one (God or man) whom I have knowingly offended and not tried to make it right (either by asking forgiveness or restoration or both). Paul wanted Timothy to have no doubt that he endured his present physical afflictions, as he had countless others, because of his unswerving faithfulness to the Lord, not as a consequence of unfaithful, ungodly living. So as Paul neared his death, he could testify that his conscience did not accuse or condemn him. His guilt was forgiven, and his devotion was undivided. To continually reject God’s truth causes the conscience to become progressively less sensitive to sin, as if covered with layers of unspiritual scar tissue. Paul’s conscience was clear, sensitive, & responsive to its convicting voice. Click on the books below to study the NT picture of conscience.

Kenneth Osbeck writes that...

The conscience has been described as the “rudder of the soul” or the believer’s “principle within.” One of the prime responsibilities of Christian living is to keep the conscience clear as to the things of God so that we might live worthy lives before our fellowmen. But the conscience must be continually enlightened and developed by an exposure to God’s Word if it is to serve as a reliable guide for our lives. A conscience that is allowed to become hardened and insensitive to sin will ultimately lead to spiritual and moral disaster. We must allow God to develop our consciences and then our consciences are able to develop us.  (Osbeck, K. W. Amazing Grace: 366 Inspiring Hymn Stories for Daily Devotions. Kregel Publications)

Conscience is the judgment which we pronounce on our own conduct by putting ourselves in the place of a bystander. (Adam Smith.)

Conscience is a dainty, delicate creature, a rare piece of workmanship of the Maker. Keep it whole without a crack, for if there be but one hole so that it break, it will with difficulty mend again. (S. Rutherford.)

The Christian can never find a “more faithful adviser, a more active accuser, a severer witness, a more impartial judge, a sweeter comforter, or a more inexorable enemy.” (Bp. Sanderson.)

Conscience in everything: — Trust that man in nothing who has not a conscience in everything. (Sterne.)

Conscience makes cowards of us; but conscience makes saints and heroes too. (J. Lightfoot.)

Conscience is a marvelous gift from God, the window that lets in the light of His truth. If we sin against Him deliberately, that window becomes dirty, and not as much truth can filter through. Eventually, the window becomes so dirty that it no longer lets in the light. The Bible calls this a defiled, seared conscience...Do you keep a clean conscience? It is a part of your inner being that responds to God's truth. When you sin, the window of your conscience becomes dirty and filters out truth. Avoid sin in your life and live with a clean conscience. Every day feed yourself truth from the Word of God. (Wiersbe, W: Prayer, Praise and Promises: Ps 51:3-6)

Hurt not your conscience with any known sin. (S. Rutherford.)

“Conscience is that faculty in me which attaches itself to the highest that I know, and tells me what the highest I know demands that I do."

“When there is any debate, quit. There is no debate possible when conscience speaks.”

Once we assuage our conscience by calling something a “necessary evil,” it begins to look more and more necessary and less and less evil. - Sidney J. Harris

As someone else has said, "She won't listen to her conscience. She doesn't want to take advice from a total stranger."  Bob Goddard

The antagonism between life and conscience may be removed in two ways: By a change of life or by a change of conscience. Leo Tolstoy.

The trouble with the advice, "Follow your conscience" is that most people follow it like someone following a wheelbarrow--they direct it wherever they want it to go, and then follow behind.

Did you know that ever since 1811 (when someone who had defrauded the government anonymously sent $5 to Washington D.C.) the U.S. Treasury has operated a Conscience Fund? Since that time almost $3.5 million has been received from guilt-ridden citizens. (Chuck Swindoll, The Quest For Character)

A good conscience and a good confidence go together. (Thomas Brooks)

Franklin P. Jones wrote that

"Conscience is a small, still voice that makes minority reports."

Someone added

"Conscience is also what makes a boy tell his mother before his sister does."

H. C. Trumbull  wrote that...

Pop used to say about the Presbyterians, 'It don't prevent them committing all the sins there are, but it keeps them from getting any fun but of it.'

The late General Omar Bradley was more serious in commenting on conscience

"The world has achieved brilliance without conscience," he conceded. "Ours is a world of nuclear giants and ethical infants."

On the subject of conscience Martin Luther declared before the court of the Roman Empire at Worms in 1521

"My conscience is captive to the Word of God. ... I am more afraid of my own heart than of the pope and all his cardinals. I have within me the great pope, Self."

When a person comes to faith in Christ, his conscience becomes acutely sensitive to sin. No longer as a Christian can he sin with impunity. The story is told about an old Indian chief who was converted. Later a missionary asked him:

"Chief, how are you doing spiritually? Are you experiencing victory over the devil?"

"It's like this," the chief replied. "I have two dogs inside me: a good dog and a bad dog. They are constantly fighting with each other."

"Which dog wins?" asked the puzzled missionary.

"Whichever one I feed the most," retorted the wise old man. His conscience was being shaped by the Scriptures.

Billy Graham set out the importance of a clear conscience

"To have a guilty conscience is a feeling. Psychologists may define it as a guilt complex, and may seek to rationalize away the sense of guilt, but once it has been awakened through the application of the law of God, no explanation will quiet the insistent voice of conscience."

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C H Spurgeon spoke frequently about conscience as seen in the following quite pithy quotations...beloved if you are contemplating sinning as you read this or are caught in the web of some sin, may the Holy Spirit of the Living God convict you of sin, righteousness and the judgment to come, not only for your sake of your Christian life but even more so for the sake of His name...

Conscience may tell me that something is wrong, but how wrong it is conscience itself does not know. Did any man's conscience, unenlightened by the Spirit, ever tell him that his sins deserved damnation? Did it ever lead any man to feel an abhorrence of sin as sin? Did conscience ever bring a man to such self-renunciation that he totally abhorred himself and all his works and came to Christ?

A man sees his enemy before him. By the light of his candle, he marks the insidious approach. His enemy is seeking his life. The man puts out the candle and then exclaims, "I am now quite at peace." That is what you do. Conscience is the candle of the Lord. It shows you your enemy. You try to put it out by saying, "Peace, peace! Put the enemy out!" God give you grace to thrust sin out!

Conscience is like a magnetic needle, which, if once turned aside from its pole, will never cease trembling. You can never make it still until it is permitted to return to its proper place.

I recollect the time when I thought that if I had to live on bread and water all my life and be chained in a dungeon, I would cheerfully submit to that if I might but get rid of my sins. When sin haunted and burdened my spirit, I am sure I would have counted the martyr's death preferable to a life under the lash of a guilty conscience

O believe me, guilt upon the conscience is worse than the body on the rack. Even the flames of the stake may be cheerfully endured, but the burnings of a conscience tormented by God are beyond all measure unendurable.

This side of hell, what can be worse than the tortures of an awakened conscience?

He was a fool who killed the watchdog because it alarmed him when thieves were breaking into his house. If conscience upbraids you, feel its upbraiding and heed its rebuke. It is your best friend.

Give me into the power of a roaring lion, but never let me come under the power of an awakened, guilty conscience. Shut me up in a dark dungeon, among all manner of loathsome creatures—snakes and reptiles of all kinds—but, oh, give me not over to my own thoughts when I am consciously guilty before God!

Fire such as martyrs felt at the stake were but a plaything compared with the flames of a burning conscience. Thunderbolts and tornadoes are nothing in force compared with the charges of a guilty conscience.

When a swarm of bees gets about a man, they are above, beneath, around, everywhere stinging, every one stinging, until he seems to be stung in every part of his body. So, when conscience wakes up the whole hive of our sins, we find ourselves compassed about with innumerable evils: sins at the board and sins on the bed, sins at the task and sins in the pew, sins in the street and sins in the shop, sins on the land and sins at sea, sins of body, soul, and spirit, sins of eye, of lip, of hand, of foot, sins everywhere. It is a horrible discovery when it seems to a man as if sin had become as omnipresent with him as God is.

The conscience of man, when he is really quickened and awakened by the Holy Spirit, speaks the truth. It rings the great alarm bell. And if he turns over in his bed, that great alarm bell rings out again and again, "The wrath to come! The wrath to come! The wrath to come! "

Nothing can be more horrible, out of hell, than to have an awakened conscience but not a reconciled God—to see sin, yet not see the Savior—to behold the deadly disease in all its loathsomeness, but not trust the good Physician, and so to have no hope of ever being healed of our malady.

I would bear any affliction rather than be burdened with a guilty conscience.

It is a blessed thing to have a conscience that will shiver when the very ghost of a sin goes by—a conscience that is not like our great steamships at sea that do not yield to every wave, but, like a cork on the water, goes up and down with every ripple, sensitive in a moment to the very approach of sin. May God the Holy Spirit make us so! This sensitiveness the Christian endeavors to have, for he knows that if he has it not, he will never be purified from his sin.

There are thousands of people in this country who would be greatly troubled in their minds if they did not go to church twice on Sundays. And they get comfort in this because their conscience is dead. If their conscience were really awakened, they would understand that there is no connection between conscience and outward forms.

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