Forgive and remember the wounds afflicted. But don't let your grudge(s) maim your mind as well.
This is a lesson that I struggle with from time to time. Any time I reflect on it, I feel the anger bubble in me, and I end up thinking about it all the time. Old emotions stir and old wounds open. It's a very dangerous poison. It's easy to walk away and do nothing. But to walk back and forgive is very, VERY hard. People underestimate that...