Apostol § 74e

If any man says, “I love God,” and hates his brother, he is a liar; for he who does not love his brother whom he has seen, how can he love God whom he has not seen? And this commandment we have from Him: that he who loves God must love his brother also.... Whosoever believes that Jesus is the Christ is bom of God, and everyone who loves Him who begot also loves him who is begotten of Him. By this we know that we love the children of God, when we love God and keep His commandments. For this is the love of God, that we keep His commandments. And His commandments are not burdensome. For whatever is bom of God overcomes the world. And this is the victory that has overcome the world; our faith. Who is he who overcomes the world, but he who believes that Jesus is the Son of God? ...