The best revenge is not to be like your enemy.
Let one thing be your joy and comfort: to move on from social act to social act, with your mind on god.
Not a whole lot to say or add to this. When it comes to action, we should not seek revenge in the traditional sense. Rather, we can disengage in the tit-for-tat game and rise above the fray - seek the higher ground.
Also, our every day acts - from moment to moment - should be social acts. To help; to serve. Let this be your joy and consolation.
(see also Citadel p. 29, 134, 196, 239)