Whoever says, “I know him,” but does not keep his commandments is a liar, and the truth is not in him. But whoever keeps his word, the love of God is truly perfected in him. This is the way we may know that we are in union with him: whoever claims to abide in him ought to live just as he lived.
Beloved, I am writing no new commandment to you but an old commandment that you had from the beginning. The old commandment is the word that you have heard. And yet