Let today be the day you stop being haunted by the ghost of yesterday. Holding a grudge & harboring anger/resentment is poison to the soul. Get even with people...but not those who have hurt us, forget them, instead get even with those who have helped us.
Part of the function of memory is to forget; the omni-retentive mind will break down and produce at best an idiot savant who can recite a telephone book, and at worst a person to whom every grudge and slight is as yesterday's.
"..."Charming people, when not actively shooting one another," a friend had once said, which was so unkind, but, like so many unkind comments, had a grain of truth in it. They shoot one another and had been doing so for centuries. They did bicker over and brood on long-dead history--or history that should be long dead. The problem with history was that it refused to lie down and die."