3 And by this we know that we have come to know him, if we keep his commandments.
4 The one who says “I have come to know him,” and does not keep his commandments is a liar, and the truth is not in this person.
5 But whoever keeps his word, truly in this person the love of God has been perfected. By this we know that we are in him.
6 The one who says that he resides in him ought also to walk just as that one walked.
7 Dear friends, I am not writing a new commandment to you, but an old commandment which you have had from the beginning. The old commandment is the message which you have heard.
8 Again, I am writing a new commandment to you, which is true in him and in you, because the darkness is passing away and the true light already is shining.
9 The one who says he is in the light and hates his brother is in the darkness until now.