What happens when a person thinks that he has done something unjust? Isn’t it true that the nobler he is, the less he resents it if he suffers hunger, cold, or the like at the hands of someone whom he believes to be inflicting this on him justly, and won’t his spirit, as I say, refuse to be aroused?
But what happens if, instead, he believes that someone has been unjust to him? Isn’t the spirit within him boiling and angry, fighting for what he believes to be just? Won’t it endure hunger, cold, and the like and keep on till it is victorious, not ceasing from noble actions until it either wins, dies, or calms down, called to heel by the reason within him, like a dog by a shepherd?Plato, The Republic