The word resentment means to re-feel...to feel again. Someone wrongs or wounds you; in resenting it, you re-feel the injury. And you re-hurt yourself. The Hebrew Talmud says that a person who bears a grudge is "Like one who, having cut one hand while handling a knife, avenges himself by stabbing the other hand."
Norman Vincent PealeAny fact facing us is not as important as our attitude toward it, for that determines our success or failure. The way you think about a fact may defeat you before you ever do anything about it. You are overcome by the fact because you think you are.
Norman Vincent Peale