Hate often does more harm to the one hating than to the one hated. When we are angry with someone or hate them or are unwilling to forgive them we foolishly and unwittingly give them power over us.
Dr. S. I. McMillen in his book None of These Diseases:
The moment I start hating a man, I become his slave. I can*t enjoy my work anymore because he even controls my thoughts. My resentments produce too many stress hormones in my body and I become fatigued after only a few hours of work. The work I formerly enjoyed is now drudgery. Even vacations cease to give me pleasure. It may be a luxurious car I drive along a lake fringed with the autumnal beauty of maple, oak and birch. As far as my experience of pleasure is concerned, I might as well be driving a wagon in mud and rain.
The man I hate hounds me wherever I go. I can*t escape his tyrannical grasp on my mind. When the waiter serves me porterhouse steak with French fries, asparagus, crisp salad, and strawberry shortcake smothered with ice cream, it might as well be stale bread and water. My teeth chew the food and I swallow it, but the man I hate will not permit me to enjoy it.
King Solomon must have had a similar experience, for he wrote:
Proverbs 15:17: Better is a dinner of herbs where love is, than a stalled ox and hatred therewith. Proverbs 17:1: Better is a dry morsel, and quietness therewith, than an house full of sacrifices with strife.
The man I hate may be many miles from my bedroom; but more cruel than any slave driver, he whips my thoughts into such a frenzy that my innerspring mattress becomes a rack of torture. The lowliest of serfs can sleep, but not I. I really must acknowledge that I am a slave to every man upon whom I pour the vials of my wrath.
Is it because human beings are dumber than grizzly bears that they can fill every moment in twenty-four hours with thoughts that fume like nitric acid and corrode as deeply? Or is man controlled far more than he realizes by an inner force . . .