If a man says, I love God, and hates his brother, he is a liar: for he that loves not his brother whom he has seen, how can he love God whom he has not seen?
All Commentaries on 1 John 4:20 Go To 1 John 4
George Leo Haydock
AD 1849
He that loveth not his brother, whom he seeth, how can he love God, whom he seeth not? By this is signified, that it is more easy and natural to love the things that we see, and that enter by the senses. Pretend not then to love the invisible God, whose perfections are hidden from you in this life, unless you love your brother whom you see. But he adds another reason to prove that no man can love God unless he love his brother; because saith he, (ver. 21.) this is God's express command, that he who loveth God love also his brother: so that a man cannot love God unless he also love his neighbour. (Witham)