"I'm having a situation right now with a friend where I'm feeling pretty angry. But revenge is corrosive and it doesn't make me feel good. . . I'll wake up in the morning and think, 'Ugh, I feel terrible', and suddenly realise, 'Ah, that's why. I'm holding on to so much hate.'"
There's a saying I heard once that really stuck with me. It goes: "Resentment is like drinking poison and expecting the other person to die." In other words, you only hurt yourself — not the person who has wronged you — when you harbor animosity. Are you good at letting a grudge go? If so, how do you do it?