Little children, let no one lead you astray. He who does righteousness is righteous, even as he is righteous.

 (iii) Further, not to love is to become a murderer. There can be no doubt that John is thinking of the words of Jesus in the Sermon on the Mount ( Matthew 5:21-22). Jesus said that the old law forbade murder but the new law declared that anger and bitterness and contempt were just as serious sins. Whenever there is hatred in the heart a man becomes a potential murderer. To allow hatred to settle in the heart is to break a definite commandment of Jesus. Therefore, the man who loves is a follower of Christ and the man who hates is no follower of his. 