Do not gloat when your enemy falls; when he stumbles, do not let your heart rejoice, or the Lord will see and disapprove and turn His wrath away from him.
(Proverbs 24:17-18)

Wow, how hard is it to obey this scripture?! I can only speak for myself, but I find satisfaction when someone "gets what they deserve." Of course, "what they deserve" is my opinion, from my sinful, judgemental viewpoint. I certainly found this scripture personally convicting and will try to work on changing my tone toward my enemies.