Charles Spurgeon Commentary 1 John 3:8-9

"he that doeth sin is of the devil; for the devil sinneth from the beginning. To this end was the Son of God manifested, that he might destroy the works of the devil. Whosoever is begotten of God doeth no sin, because his seed abideth in him: and he cannot sin, because he is begotten of God." — 1 John 3:8-9 (ASV)

For the purpose the Son of God was manifested; that he might destroy the works of the devil. Whoever is born of God does not commit sin;

That is to say, this is not the course, and habit, and tenor of his life; there is sin in much that he does, but he hates it, loathes it, and flees from it.

He that committeth sin is of the devil; for the devil sinneth from the beginning. For this purpose the Son of God was manifested, that he might destroy the works of the devil. Whosoever is born of God doth not commit sin; for his seed remaineth in him: and he cannot sin, because he is born of God.

He sins not with any pleasure; it is not the course of his life.

There are, alas! in the best of men, infirmities and imperfections and failures. Oh, that these were all removed! Still, the man is not what he used to be; though he is not what he shall be, he is not what he once was.