John writes to his little children so that they may not sin. But if anyone does sin, they have an advocate with the Father, Jesus Christ the righteous, who is the propitiation for our sins, and not for ours only but for the sins of the whole world. We know that we know him if we keep his commandments. Whoever says he knows him but does not obey is a liar, and whoever says he abides in him ought to walk as he walked (vv. 1-6).
It is not a new commandment but an old one from the beginning, and yet new, because the darkness is passing away and the true light is already shining. Whoever says he is in the light but hates his brother is still in darkness, and whoever loves his brother abides in the light. John then tells little children, fathers and young men that their sins are forgiven, that they know him who is from the beginning and that they have overcome the evil one (vv. 7-14).
John commands them not to love the world or the things in it: the desires of the flesh, the desires of the eyes and the pride of life are not from the Father. The world is passing away with its desires, but whoever does the will of God abides forever. It is the last hour, and many antichrists have come. They went out from us because they were not of us; had they been, they would have stayed. Believers have an anointing from the Holy One and know the truth. The liar is the one who denies that Jesus is the Christ, and whoever denies the Son does not have the Father either (vv. 15-23).
Let what they heard from the beginning abide in them, and they will abide in the Son and in the Father, with the promise of eternal life. The anointing they received abides in them and teaches them. Little children, abide in him, so that when he appears we may have confidence and not shrink in shame. Everyone who practices righteousness has been born of him (vv. 24-29).