Like an unchecked cancer, hate corrodes the personality and eats away its vital unity. Hate destroys a man's sense of values and his objectivity. It causes him to describe the beautiful as ugly and the ugly as beautiful, and to confuse the true with the false, and the false with the true.
It's not only necessary to know how to go about loving your enemies, but also to go down into the question of why we should love our enemies. I think the first reason that we should love our enemies, and I think this was at the very center of Jesus' thinking, is this: that hate for hate only intensifies the existence of hate and evil in the universe. If I hit you and you hit me and I hit you back and you hit me back and go on, you see, that goes on ad infinitum. It just never ends. Somewhere somebody must have a little sense, and that's the strong person. The strong person is the person who can cut off the chain of hate, the chain of evil.
delivered at Dexter Avenue Baptist Church in Montgomery, AL
There's another reason why you should love your enemies, and that is because hate distorts the personality of the hater. We usually think of what hate does for the individual hated or the individuals hated or the groups hated. But it is even more tragic, it is even more ruinous and injurious to the individual who hates. ... For the person who hates, the true becomes false and the false becomes true. That's what hate does.
Neither prosperity nor empire nor heaven can be worth winning at the price of a virulent temper, bloody hands, an anguished spirit, and a vain hatred of the rest of the world.
Hatred is a thing of the heart, contempt a thing of the head. Hatred and contempt are decidedly antagonistic towards one another and mutually exclusive. A great deal of hatred, indeed, has no other source than a compelled respect for the superior qualities of some other person; conversely, if you were to consider hating every miserable wretch you met you would have your work cut out: it is much easier to despise them one and all. True, genuine contempt, which is the obverse of true, genuine pride, stays hidden away in secret and lets no one suspect its existence: for if you let a person you despise notice the fact, you thereby reveal a certain respect for him, inasmuch as you want him to know how low you rate him—which betrays not contempt but hatred, which excludes contempt and only affects it. Genuine contempt, on the other hand, is the unsullied conviction of the worthlessness of another.