1 John 5:17, 18
    All unrighteousness is sin: and there is a sin not unto death. We know that whosoever is born of God sinneth not; but he that is begotten of God keepeth himself, and that wicked one toucheth him not.

John begins by saying all unrighteousness is sin. He does not blur the line. He does not excuse what is crooked. He does not make peace with darkness. All unrighteousness is sin.

Then he adds that there is a sin not unto death. That keeps us from panic when we see failure in the life of a believer. Sin is serious, but every stumble is not proof that a man is lost beyond hope. John has already told us to pray for a brother who sins, and here he reminds us again that the issue is not sinless perfection, but the direction of a life.

That is why he says, “Whosoever is born of God sinneth not.” He is not saying the child of God never falls. He is saying the child of God does not practice sin as a settled trade. He does not work at getting better at rebellion. He does not make peace with darkness and call it home. Sin may still appear, but it is no longer the pattern he loves.

That is an important distinction.

A sheep may fall in the mud, but a pig loves the mire. A believer may stumble into sin, grieve over it, confess it, and be restored. But the one born of God cannot live contentedly in sin as though nothing has changed. There is a new life within. There is a new nature. There is a new hunger for what is right.

Then John gives one of the sweetest lines in the passage. “He that is begotten of God keepeth himself, and that wicked one toucheth him not.” The sense of the original points beyond us to Jesus Himself. He who is begotten of God keeps him. In other words, Jesus keeps the believer.

That changes the whole tone of the verse.

The Christian life is not merely me trying to hold on to Christ with tired hands. It is Christ holding on to me. Jude 24 says, “Now unto him that is able to keep you from falling, and to present you faultless before the presence of his glory with exceeding joy.” That is the hope of the believer. I am kept by Jesus.

And because I am kept by Jesus, the wicked one cannot lay hold of me in the way he desires. Satan may harass, accuse, tempt, and intimidate, but he cannot own the child whom Jesus keeps. That is why demon possession in a Christian is impossible. The believer is not empty ground waiting to be occupied. He belongs to Christ. Greater is He that is in you than he that is in the world, just as John already said in 1 John 4:4.

That gives real assurance.

The enemy would love to make us think we are exposed, vulnerable, and barely hanging on. But John says the wicked one toucheth him not. Not because the believer is strong in himself, but because Jesus is strong for him. Not because the sheep is fierce, but because the Shepherd is faithful.

So the passage holds two truths together. Sin is still sin, and the believer does not toy with it. But the believer is also kept. He is guarded. He is watched over by the Son of God Himself. That means when I stumble, I do not despair as though I have slipped out of His hand. I confess, I rise, and I keep walking because I am kept by Another.

Beloved, that is strong comfort. The one born of God does not settle into sin, and the one born of God is not left alone in the fight. Jesus keeps him. And because Jesus keeps him, the wicked one cannot finally seize what belongs to the Son.