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.
For the devil sinneth from the beginning - The beginning of the world; or from the first account we have of him. It does not mean that he sinned from the beginning of his existence, for he was made holy like the other angels. Notes, Jude 1:6. The meaning is, that he introduced sin into the universe, and that he has continued to practice it ever since. The word sinneth here implies continued and habitual sin. He did not commit one act of sin and then reform; but he has continued, and still continues, his course of sin. This may confirm what has been already said about the kind of sin that John refers to. He speaks of sinning habitually, continuously, willfully; and anyone who does this shows that he is under the influence of him whose characteristic it has been and is to sin.