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4Every one who commits sin is guilty of lawlessness; sin is lawlessness. 5You know that he appeared to take away sins, and in him there is no sin. 6No one who abides in him sins; no one who sins has either seen him or known him. 7Little children, let no one deceive you. He who does right is righteous, as he is righteous. 8He who commits sin is of the devil; for the devil has sinned from the beginning. The reason the Son of God appeared was to destroy the works of the devil. 9No one born of God commits sin; for God's nature abides in him, and he cannot sin because he is born of God. 10By this it may be seen who are the children of God, and who are the children of the devil: whoever does not do right is not of God, nor he who does not love his brother.
1 John 3:4-10 (RSV)