“Kill Sin Before It Kills You”: How Hidden Sin Hardens the Heart and How Christ Sets Us Free
There is a dangerous lie many Christians begin to believe: that sin can be tolerated as long as it stays small.
The Puritans fiercely rejected this idea. They knew that sin is never content to remain weak or hidden. If it is not destroyed, it will slowly gain power over the soul.
The great Puritan John Owen issued a warning that has echoed for centuries:
“Be killing sin, or sin will be killing you.”
Sin is not passive. It works constantly—quietly shaping desires, dulling conviction, and weakening the heart. If we do not fight it, it will slowly take ground in our lives.
Yet the gospel does not leave us helpless. God has given us both the warning and the weapon to defeat sin.
The Command of Scripture: Put Sin to Death
The Bible never tells believers to simply manage sin. It commands us to destroy it.
Romans 8:13 (KJV)
“For if ye live after the flesh, ye shall die: but if ye through the Spirit do mortify the deeds of the body, ye shall live.”
The word mortify means to put to death. The Christian life is not passive. It is an active war against the flesh.
Paul repeats this command again:
Colossians 3:5 (KJV)
“Mortify therefore your members which are upon the earth; fornication, uncleanness, inordinate affection, evil concupiscence, and covetousness, which is idolatry.”
The Puritans understood that sin must be treated like a deadly enemy—not a bad habit.
Sin Gains Strength When It Is Fed
One reason sin grows is because we feed it through what we allow into our eyes and minds.
David understood this danger and made a deliberate decision:
Psalm 101:3 (KJV)
“I will set no wicked thing before mine eyes.”
David knew that what we repeatedly look at eventually shapes what we desire. The heart begins to move toward what the eyes continually behold.
Puritan pastor Thomas Watson warned:
“A little sin will usher in greater sins.”
Sin rarely explodes overnight. It usually grows slowly, fed by small compromises.
The things we watch, listen to, and dwell upon are not neutral. They are quietly forming our hearts.
If we feed the flesh, the flesh will grow stronger.
Why Focusing on Sin Alone Can Empower It
Another danger is constantly staring at sin itself rather than looking to Christ.
Scripture teaches a surprising truth:
1 Corinthians 15:56 (KJV)
“The sting of death is sin; and the strength of sin is the law.”
The law exposes sin, but it does not give the power to conquer it. When the heart constantly focuses on the forbidden thing, the flesh often becomes more fascinated with it.
This is why many believers feel trapped in cycles of temptation. They are constantly thinking about sin, fearing sin, and analyzing sin—but they are not fixing their eyes on Christ.
The Christian life is not primarily about staring harder at the problem. It is about looking to the Savior.
The Lesson from Peter Walking on Water
A powerful picture of this truth appears in the story of Peter walking on the sea.
Matthew 14:29–30 (KJV)
“And when Peter was come down out of the ship, he walked on the water, to go to Jesus.
But when he saw the wind boisterous, he was afraid; and beginning to sink…”
Peter did something impossible while his eyes were on Christ. The moment his focus shifted to the storm, he began to sink.
The same principle applies to the Christian life.
When we constantly fix our attention on temptation and fear, we begin to sink spiritually. But when our eyes remain on Christ, we find strength to walk where we never could before.
Hebrews 12:2 (KJV)
“Looking unto Jesus the author and finisher of our faith.”
Holiness grows not merely by resisting sin but by beholding Christ.
You Become What You Look At
The Bible teaches that what we continually behold eventually transforms us.
2 Corinthians 3:18 (KJV)
“But we all, with open face beholding as in a glass the glory of the Lord, are changed into the same image from glory to glory.”
This principle works in both directions.
If we constantly fill our minds with the world, we slowly become worldly. If we continually dwell on temptation, it begins to shape our desires.
But if we spend time daily looking to Christ—through Scripture, prayer, and worship—His character begins to reshape our hearts.
We begin to love what He loves and hate what He hates.
The Danger of Sin Left Unchecked
Perhaps the greatest danger of sin is what happens when it is allowed to remain.
Sin has a terrifying ability to slowly harden the heart.
What once shocked us eventually stops bothering us.
What once convicted us eventually feels normal.
Scripture warns about this process:
Hebrews 3:13 (KJV)
“But exhort one another daily… lest any of you be hardened through the deceitfulness of sin.”
Notice the phrase: the deceitfulness of sin.
Sin does not merely tempt—it deceives. It slowly convinces the heart that what God calls evil is not really that serious.
The Tragic Example of Balaam
A sobering example of this deception appears in the story of Balaam.
In the book of Numbers, the enemies of Israel repeatedly came to Balaam and asked him to curse God’s people. At first, Balaam refused because God had clearly told him not to do it.
But the story does not end there.
The men returned again. They offered greater honor and greater reward. And instead of dismissing them immediately, Balaam began to entertain the possibility.
He tried to find ways around God’s command.
His heart slowly shifted from obedience to compromise.
Eventually his greed and ambition corrupted him. Though he could not curse Israel directly, he later taught Israel’s enemies how to corrupt the people through sin.
What began as a refusal eventually became a deceived heart.
Balaam is a warning to every believer: when we refuse to fully surrender sin, the heart begins to look for ways to justify it.
We start saying things like:
- “It’s not that serious.”
- “God understands.”
- “Everyone struggles with something.”
Sin slowly convinces us that God is comfortable with what He clearly condemns.
This is the deceitfulness of sin at work.
The Word of God Cleanses the Heart
The antidote to sin’s deception is the truth of God’s Word.
Jesus prayed for His followers:
John 17:17 (KJV)
“Sanctify them through thy truth: thy word is truth.”
And the psalmist asked:
Psalm 119:9 (KJV)
“Wherewithal shall a young man cleanse his way? By taking heed thereto according to thy word.”
The Puritans were relentless students of Scripture because they believed the Word of God purifies the heart.
Thomas Watson wrote:
“The Word of God is both a mirror to show us our spots and a laver to wash them away.”
The more we saturate our minds with Scripture, the more clearly we see sin—and the more strength we receive to overcome it.
Starve Sin and Feed Your Soul
Killing sin involves two actions happening at the same time.
First, starve the flesh.
Remove what feeds temptation. Guard your eyes. Guard your influences. Refuse to entertain the thoughts that lead you toward disobedience.
Second, feed your soul.
Fill your mind with Scripture. Spend time with Christ. Seek His presence in prayer and obedience.
The heart cannot remain empty. If we remove sin without filling our lives with Christ, the flesh will eventually return.
But when the soul is satisfied in Christ, sin begins to lose its attraction.
The Hope of the Gospel
The fight against sin is real, but Scripture gives a powerful promise.
Romans 6:14 (KJV)
“For sin shall not have dominion over you: for ye are not under the law, but under grace.”
Grace does not excuse sin. Grace breaks its power.
Through the Holy Spirit, through the truth of Scripture, and through fixing our eyes on Christ, real transformation is possible.
The Daily Choice
Every day we choose what we will look at and what we will love.
If we constantly look at the world, we will become worldly.
If we continually dwell on temptation, it will grow stronger.
But if we daily look unto Jesus, walk with Him, and fill our minds with His Word, something remarkable happens.
Slowly, steadily, powerfully—
we begin to become like Him.
And that is the great secret the Puritans understood:
Sin dies when Christ becomes the center of our attention.
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