Now by this we may be sure that we know him, if we obey his commandments. Whoever says, “I have come to know him,” but does not obey his commandments, is a liar, and in such a person the truth does not exist; but whoever obeys his word, truly in this person the love of God has reached perfection. By this we may be sure that we are in him: whoever says, “I abide in him,” ought to walk just as he walked. Beloved, I am writing you no new commandment, but an old commandment that you have had...