Have you ever noticed that we talk about grudges like they're helpless infants who need our care? We "nurse" grudges and "hold" grudges and "suckle them at our bosoms like little newborn infants who need nutrition." All are common and accurate idioms to describe what it takes to carry a tiny baby insult to a full grown manbeast that has its own pubic hair and a mortgage.
Despite the coddling, nursing, and suckling it takes to keep them alive, there is nothing that will rot your soul from the inside out more thoroughly than a grudge. Even when they're completely justified, those little pockets of resentment that you secretly harbor for a rainy day are as poisonous as strychnine on a Bret Michaels sandwich, and the first thing they murder is your own peace of mind. The second thing they murder is your relationships. The third thing is the Pope, but usually the poison doesn't spread beyond the first few victims.
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As a kid, your grudges are managed by the people around you. Staying angry at your brother for peeing anarchy symbols all over your door is as reasonable an option as buying a whole new door, so you're quick to let things go. If you're not bleeding or emotionally traumatized, your parents probably don't care that the universe hasn't treated you fairly, which is why petty grudges get dropped during commercial breaks. As a grownup, the grudge police don't exist. Unless you're dealing with grudges that come from actual crimes, in which case go ahead and use the real-world police as your grudge police.
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