John Calvin on 1 John 3:6

6 Whosoever sinneth hath not seen him. According to his usual manner he added the opposite clause, that we may know that faith in Christ and knowledge of him are vainly pretended, except there be newness of life. For Christ is never dormant where he reigns, but the Spirit renders effectual his power. And it may be rightly said of him, that he puts sin to flight, not otherwise than as the sun drives away darkness by its own brightness. But we are again taught in this place how strong and efficacious is the knowledge of Christ; for it transforms us into his image. So by seeing and knowing we are to understand no other thing than faith.

1 John 3:7-10

7. Little children, let no man deceive you: he that doeth righteousness is righteous, even as he is righteous.

7. Filioli, nemo vos decipiat; qai facit justitiam justus est, quemadmodum ille justus est.

8. 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.

8. Qui facit peccatum, ex diabolo est; quia ab initio diabolus peccat: in hoc manifestus est Filius Dei, ut solvat opera diaboli.

9. 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.

9. Quisquis natus est ex Deo, peccatum non facit, quoniam semen ejus in ipso manet; et non potest peccare, quia ex Deo genitus est.

10. In this the children of God are manifest, and the children of the devil:

10. In hoc manifesti sunt filii Dei et filii Diaboli, —