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 him.
5 But whoever keeps His word, in him the love of God is truly made perfect. We know that we are in Him by this—
6 whoever claims to abide in Him must walk just as He walked.
7 Loved ones, I am not writing a new commandment for you, but an old commandment—one you had from the beginning. This old commandment is the word you have heard.
8 Yet I am writing a new commandment for you, which is true in Him and in you, because the darkness is fading and the true light is already shining.
9 The one who says he is in the light and hates his brother is still in the darkness.
10 The one who loves his brother abides in the light, and in him there is no cause for stumbling.