To quote a famous video:
"Rogues are scissors. Warriors are rock. Hunters, Paladins, Mages, Priests, Druids, and Shamans are paper. Warlocks are mushrooms.
Paper beats rock. Scissors beats paper. Scissors also happen to beat rock. Until rock hits level 60 at which point rock becomes an unstoppable killing machine that also beats paper and would beat scissors, but it can’t find scissors. Because scissors are invisible.
So scissors beats paper, and avoids rock, and that is called ‘Balance’."