Killing Sin
Forgiveness
Submission & Surrender
Repentance
Spiritual Fasting
Taking Thoughts Captive
"For if you live according to the flesh you will die, but if by the Spirit you put to death the deeds of the body, you will live." — Romans 8:13
The Christian life contains a fight. Not a metaphorical one. A real, ongoing, lifelong campaign against the indwelling sin that remains in the man after his conversion and that does not stop trying to kill him. The man who refuses to recognize this fight is not at peace. He is being killed quietly by what he is refusing to engage.
The Walking with God parent already established the binary — be killing sin or sin will be killing you. This page goes further. It addresses why sin must be killed rather than managed, what brokenness has to do with the killing, the toolkit the believer is given, the brotherhood the campaign requires, and the warning of what happens to the watchman who stops watching. Each child page in this folder takes one tool from the toolkit and develops it. This page is the framing.
Why "Kill" and Not "Manage"
The man who decides to manage his sin instead of kill it has already lost.
Sin is not a static substance held in a container at a controlled level. It is a parasite. It feeds on the host. It grows stronger with every accommodation, every minimization, every interpretive frame the man builds to make peace with its presence. A man who has decided to manage his anger will become an angrier man. A man who has decided to manage his lust will become a more lust-ridden man. A man who has decided to manage his pride will become more proud. The management strategy is not stable. It is a slope.
John Owen's Mortification of Sin — a seventeenth-century Puritan work that has not been improved upon — names the principle without softening it. Be killing sin or sin will be killing you. There is no third option. The Christian life does not contain a demilitarized zone where the believer and his sin coexist on agreed terms. The relationship is hostile. It is hostile by design — the Spirit and the flesh are at war within him, and he has been called to side with the Spirit and to take up arms against the flesh.
To kill sin is not to achieve sinlessness in this life. The man who claims that achievement is deceived. To kill sin is to refuse the truce, to deny the parasite its access, to fight the patterns one by one with the means God has given. The killing is daily. The man does not arrive at the point where the killing is no longer necessary. He arrives at the point where the killing has produced something — a man whose patterns are being slowly, actually changed.
The Myth of the Acceptable Sin
Every man who is not killing his sin has constructed a list of acceptable ones — the patterns he has decided are not serious enough to require the campaign.
The list usually contains the same items: a measured indulgence in an appetite he has agreed to keep within limits; a posture of resentment toward someone he has decided deserves it; a private dishonesty about his finances or his time that he frames as practical rather than ethical; a recurring pattern of speech he has rationalized as personality. Each item on the list has been examined and approved. Each one is contributing more damage to him and to those around him than he is currently capable of seeing.
There are no acceptable sins. The category does not exist in scripture. The patterns the man has approved are precisely the patterns the enemy is using to keep him in slow degradation. "A little leaven leavens the whole lump." — 1 Corinthians 5:6. The leaven the man has tolerated is not staying small. It is working through the dough.
The first move in killing sin is taking the list, reading it honestly, and revoking the approval. The man does not have to address every item at once. He has to stop calling them acceptable.
Brokenness as the Beginning
A man cannot kill what he is still in love with.
This is why brokenness precedes mortification in the actual order of operations. The man who has not been broken over his sin will defend it. He will minimize it, contextualize it, blame the conditions, blame the people involved, and produce sophisticated arguments for why his case is different. Brokenness is what ends the defense. It is the moment at which the man stops arguing and begins grieving — not grieving that he was caught, not grieving the consequences, but grieving the sin itself, the way it has wounded the relationship with God, the way it has revealed something true about his own interior that he had been avoiding.
Voddie Baucham has named this rightly. The brokenness is not a feeling to be manufactured. It is the response that becomes possible when the man finally sees what he has been doing in the light of who God actually is. He cannot produce that response on demand. He can put himself in the path of it — through honest scripture, through honest counsel, through the willingness to stop performing and let the actual condition surface.
The Empty Room / Surrender / Brokenness thread that ran through the Desire and Faith Elements lands here in Fundamental Practices. The same brokenness that opens the man to faith is the brokenness that opens him to the killing of sin. They are not separate works. They are one work that becomes visible at different layers.
The Toolkit
The man at war is not unequipped. The believer has been given a specific set of tools, and each child page in this folder addresses one of them.
Repentance is the change of mind — the honest reorientation away from the sin and back toward God. It is not an emotion. It is a turn. Without it, no other tool functions, because the man is still facing the wrong direction.
Forgiveness is the release of the grievance the man holds against another — and the receipt of the forgiveness God has extended to him. Unforgiveness is one of the most reliable footholds the enemy uses to keep a man in bondage. The killing of sin includes the killing of the resentments that feed it.
Spiritual Fasting is the deliberate denial of the flesh — the demonstration to the body that it is not in command. Fasting weakens the appetite that has been ruling the man and strengthens the appetite that has been starving. It is not a hunger strike. It is a recalibration of who is in charge.
Submission and Surrender is the posture beneath all of this — the daily, repeated release of self-rule into the rule of God. Without this posture, every other tool becomes a self-improvement technique. With it, the tools become means of grace.
Taking Thoughts Captive is the front-line discipline — the moment-by-moment work of catching the thought before it produces the action, examining it under the authority of Christ, and either dismissing it or redirecting it. Most sin is downstream of an unchecked thought. The man who learns to catch his thoughts is the man whose actions can be governed.
These five are not optional. They are the standard equipment. The man who uses them will be in the fight. The man who neglects them is not in the fight, regardless of how he frames his Christian life to himself.
The Brotherhood Requirement
Sin is killed in the dark when no one else is watching. It is also killed in the light, in the presence of brothers who know the man and have permission to confront him.
A man who is fighting his sin alone has chosen the most disadvantageous battlefield available. The enemy specializes in isolation — in the construction of the private interior in which the man's sin can argue with him without interruption, can frame itself favorably, can promise relief, and can deliver consequences he then has to hide. The brother who knows the man — who has heard the actual confession, who is permitted to ask the direct question, who will not flinch when the answer is ugly — disrupts the entire mechanism.
This is why discipleship and brotherhood are not optional features of the Christian life. They are the structural support without which the man's own resolution will not hold. Paul Washer has preached on this with severity that the modern church has largely refused to absorb. The man without a real brother is the man whose sin will eventually win, regardless of how strong he believes himself to be.
The Killing Sin campaign requires the room to confess. It requires the man permitted to hear the confession without managing the man. It requires the slow, costly work of letting another man see what is actually happening. The man who refuses this is not preserving his dignity. He is preserving the conditions under which his sin continues to operate.
When the Watchman Falls
Steve Lawson preached for decades on the necessity of holiness. He fell publicly in 2024 — disqualified from ministry by an inappropriate relationship he had been concealing. The fall is a warning, not gossip. The lesson is not that he was a hypocrite. The lesson is that a man who has spent forty years calling other men to the war can stop fighting it himself in the interior, and the eventual exposure is the consequence of an internal compromise that began long before the public discovery.
No man is exempt. The decades of teaching, the depth of doctrine, the public ministry, the visible fruit — none of it produces immunity. The killing of sin is daily. The day a man stops killing his sin is the day his sin begins killing him, regardless of his pulpit, his platform, or his past faithfulness. The fall, when it comes, is not the failure. The fall is the surfacing of the failure that had already happened in private.
The warning to the man reading this is direct. The strongest believer in the room is not the one with the longest record. He is the one who is currently fighting. The record is yesterday. The fight is today. "Therefore let anyone who thinks that he stands take heed lest he fall." — 1 Corinthians 10:12.
Declaring War
The killing of sin is not a private psychological discipline. It is a battle in a war that is already in progress.
"For we do not wrestle against flesh and blood, but against the rulers, against the authorities, against the cosmic powers over this present darkness, against the spiritual forces of evil in the heavenly places. Therefore take up the whole armor of God, that you may be able to withstand in the evil day, and having done all, to stand firm." — Ephesians 6:12-13.
The armor is given. Truth as belt. Righteousness as breastplate. The gospel of peace as the footing. Faith as shield. Salvation as helmet. The word of God as the only offensive weapon. Each piece corresponds to a real condition the believer must put on actively, not assume he is wearing because he is in the church. The man who is not consciously armored is exposed.
The full Spiritual Warfare cluster — its own folder in Fundamental Practices — develops the mechanics of the war. The relevant point here is that the killing of sin is one front of that war, and it is fought with the same equipment. The man who wants to take his sin seriously has already entered combat whether he understands it that way or not. The choice is whether he fights with the equipment given or fights with his own resources, which are insufficient.
The Overcomer
The book of Revelation contains a series of promises made specifically to the one who overcomes — the one who keeps fighting until the end. The promises are extraordinary. The right to eat from the tree of life. The crown of life. The hidden manna. Authority over the nations. The morning star. White garments. A name that will not be blotted from the book of life. A pillar in the temple of God. A seat with Christ on his throne.
These are not metaphor. They are the actual inheritance promised to the man who fights and finishes. The fight is not pointless. The killing is not arbitrary discipline. The man who is doing the work is being prepared for something the seventy or eighty years of this life cannot contain.
"He who overcomes will inherit all things." — Revelation 21:7.
The killing of sin is part of the formation that produces the overcomer. The man who refuses the work is not yet who he will be. The man who is in the fight is becoming who he will be — slowly, painfully, with many setbacks, but actually becoming. The walk is long. The reward is real.
Cross References
Walking with God
Forgiveness
Repentance
Spiritual Fasting
Submission & Surrender
Taking Thoughts Captive
Spiritual Warfare
Perseverance of the Saints
Obedience
Fear of the Lord