In the comedy, "The Three Stooges," there is a scene where Curly and Moe are angry with each other.  The smaller of the two men always comes out being the loser, so Curly says, "I'm going to strap a stick of dynamite to my chest, so the next time he hits me, he'll get blown up!"  Sure!  That's what happens when you plot revenge on someone who has hurt you.  Revenge not only destroys your enemy; it destroys you at the same time.