Do you realize that if it is wrong to do a certain thing, it is wrong to harbor thoughts of that thing in your mind? Sin is thinking thoughts you ought not to be thinking about things you ought not to be doing while you are thinking that kind of thoughts. How does sin actually happen? Every man is tempted when he is drawn away of his own lust and desire, and enticed. Then, when lust in the mind has conceived, it brings forth sin; and sin, when it is finished, brings forth death. The temptation is in the mind. When you think about the thing that tempts you, letting your mind dwell on it, turning it over in your mind—whether it be a desire to go somewhere, to do something, or to have something you know is wrong—that thinking about it finally conceives and leads to action, breeding sin. If you keep thinking about it, after a while you'll be unable to resist it. The way to prevent sin is to let God's Spirit fill the mind. Set your affection on things above, not on things on the earth. The way to put a thing out of the mind is to put an opposite thought in the mind. Try using this method on yourself. Open your Bible. Put the study of some spiritual subject in your mind. Next time you are tempted, pray over it and ask God to help you. See how rapidly you begin to win the victory over temptation and sin, and how marvelous will be your spiritual and character growth.

The struggle to avoid sin is presented as an active, daily warfare rather than a passive experience of forgiveness. This principle is anchored in Christ's words to the sleeping disciples in Gethsemane: "Watch and pray, lest you enter into temptation. The spirit indeed is willing, but the flesh is weak." Their falling asleep was itself sin, understood here not merely as transgression of law but as falling short of the glory of God—failing to do what God would do in the same situation. The flesh is not passive toward sin but eagerly and aggressively seeks it, attacking at weak points even when a person sincerely desires to obey God, as the disciples had just pledged loyalty only hours before their failure. Watchfulness and prayer together form the indispensable defense against temptation: watchfulness discerns the danger, while prayer supplies the strength to resist it. To watch without praying is presumption, assuming sufficient strength in oneself; to pray without watching is likewise presumption, and even hypocrisy, since it assumes God will act while we take no responsibility. Both elements must work together. A practical illustration is given: a person with a drinking problem who deliberately enters a bar is not truly watching, since he places himself in the path of temptation rather than fleeing it as Joseph did. Avoiding sin therefore requires taking positive action—removing oneself from occasions of temptation rather than passively hoping to withstand them. The disciples, for example, should have kept themselves moving and praying rather than remaining in a position where sleep could overtake them; deliberate effort to stay spiritually alert is what secures victory. Galatians 5 reinforces this by stating that the flesh lusts against the Spirit, so that believers "cannot" do what they wish—meaning they must not allow such conflict to result in surrender to the flesh. Those who belong to Christ have crucified the flesh with its passions, a continual act of self-denial and sacrifice rather than a single event. Bearing one's cross is likewise tied to this struggle, since sin's burden resides in the mind and must be fought without cessation throughout the course of discipleship. The world's attractiveness intensifies the difficulty of avoiding sin, since it operates through the lust of the flesh, the lust of the eyes, and the pride of life, drawing human nature toward its values by natural affinity. Loving the world and loving the Father cannot coexist, requiring a decisive and continually renewed choice. Regarding Satan, though formidable in power and cunning, he cannot force anyone to sin; he can only persuade, deceive, tempt, and confuse. Believers are urged to recognize his devious reasonings and refuse them, resisting so that, according to scriptural promise, he will flee. This resistance involves casting down arguments that exalt themselves against the knowledge of God and bringing every thought into obedience to Christ. Avoiding sin, then, is depicted as vigilant, deliberate, and continuous warfare—demanding alertness, prayer, self-denial, and firm choice against the combined pull of the flesh, the world, and the Devil.