I have heard say that "revenge is a dish best served cold".
I think this is very good advice as by the time it gets "cold" I am no longer interested.
I do not do things GENERALLY out of revenge though I feel sure in my life I have probably done a few things out of revenge.
They were not big things or I would remember them.
I basically do not believe in revenge as I believe in Karma (not Hub Garden karma!) and it is therefore not necessary to seek revenge.
I get angry however simmer down and revenge is for me, a waste of effort.