21. Another reason why a man cannot love God and hate his neighbour, is that the best proof we can give of our love of God is, the observance of his commandments. “If you love me,” says our blessed Lord, “keep my commandments.” Now, it is one of God’s commandments, that we should love our brethren, as we love ourselves. The man, therefore, who hates his brother, or does not love him as he ought, that is to say, “in deed and truth,” or relieve him in his necessities, such a man violates the commandments;
1 John 4:21