"I was the naughty kid that the teachers liked. I bullied a kid in the 1st year when I was in the 2nd, who then hit puberty like a plane crash and grew into a gorilla who bullied me when he was in the 4th year and I was in the 5th. That's Karma."

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...here also forgiving does not mean excusing. Many people seem to think it does. They think that if you ask them to forgive someone who has cheated or bullied them you are trying to make out that there was really no cheating or bullying. But if that were so, there would be nothing to forgive. (This doesn't mean that you must necessarily believe his next promise. It does mean that you must make every effort to kill every taste of resentment in your own heart - every wish to humiliate or hurt him or to pay him out.)

— C. S. Lewis