3 And in this we do know that we have known him if we keep his commandments.
4 He that says, I have known him, and does not keep his commandments, is a liar, and the truth is not in him.
5 But whosoever keeps his word, in him verily is the charity of God perfected: hereby know we that we are in him.
6 He that says he abides in him ought himself also so to walk, even as he walked.
7 Brethren, I write no new commandment unto you, but an old commandment which ye have had from the beginning. The old commandment is the word which ye have heard from the beginning.
8 Again, a new commandment I write unto you, which is the truth in him and in you, because the darkness is past, and the true light now shines.
9 He that says he is in the light and hates his brother is still in darkness.