When the born-loser type personality looks for a scapegoat for his own failure, he often blames someone or something else: the establishment, life, the breaks. He resents the success and happiness of others because his own life, by comparison, is unhappy. He has been somehow deprived. We are all tempted to make our own failures understandable by explaining them in terms of something other than our own inadequacies. Unfair treatment by others, injustice, the conspiracy of circumstances, etc. make our failures easier to face.
The resenter uses up all his energies resenting, and therefore usually accomplishes very little. Sometimes it seems that the most vicious of critics of anything are very often the ones who do nothing for the institutions which they criticize so vocally.
The resentful person is forever trying to bring his case before the court of life, hoping that the jury of others will acquit him of his failures.
Resentment comes from the latin resentire (to feel all over again). The resenter is always rehashing the past, reliving past battles he cannot win, and he often persists in his game for a lifetime. Resentment becomes an emotional habit. No one's feelings are caused by others. Our feelings are caused by our own choices and reactions. The resenter is a reactor, not an actor, and eventually, when he realizes this, he is left with no vestiges of self respect. He has spent his life employing a failure mechanism, and he somehow knows it.