When a Christian Acts as a Child of Satan
Does John mean that a Christian does not sin, or that he ceases to be a Christian if he sins? The opposite is taught in this very Epistle. John is writing these things that Christians may not sin, but he recognizes that they may, and tells them just what to do to have the sin cleansed away in case they do sin.
When a Christian sins, he is acting against his true nature. That is the argument of First John and of all the Epistles. When a Christian sins, he is acting as though he were a child of the devil. He as a child of God can have nothing to do with sin. But there is his free will to step out of the place of abiding, and this makes possible the tragedy of a Christian’s sinning.
James is facing this tragedy of a Christian’s acting against his true nature when he exclaims: “Doth the fountain send forth from the same opening sweet water and bitter? can a fig tree, my brethren, yield olives, or a vine figs? neither can salt water yield sweet” (James 3:10-12). All these things act according to their true nature. If a Christian acted thus there would flow always from his life and lips the fruit of the Spirit. But the Apostle shows in the passage that a Christian may pray with the same mouth that he uses to say mean things about his neighbor, and that he may have in his heart “bitter jealousy and faction.”
Here, then, is our foundation truth that God has but one standard for the Christian life, one kind of holiness, and that is the standard of his Son, who is to be our life. And that Life, that holiness, God has given to every Christian.