Revenge, good or bad? Part of the cycle of healing (anger)? or not?

As a person who used to have anger management issues, i can tell you that it is very hard to not seek revenge on someone who wronged you. Never seek revenge on someone, feel sorry for that person instead. No, it's not always a good thing to depend on karma(what goes around, comes around), but it's still good to believe in the theory behind karma. Hope this helps!