He who sins is of the devil, for the devil has been sinning from the beginning. To this end the Son of God was revealed, that he might destroy the works of the devil.

 (iii) He tells us why sin is. It comes from the failure to abide in Christ. We need not think that this is a truth only for advanced mystics. It simply means this--so long as we remember the continual presence of Jesus, we will not sin; it is when we forget that presence that we sin. 