Nassim Nicholas Taleb. Anthropist (№ 393103)

My definition of a loser is this: if you make mistakes, the loser does not analyze the situation, do not benefit from their mistakes, become confused and withdraws into himself, instead be glad that he learned something new; he's trying to explain why you were wrong instead of moving on. These types often consider themselves the victims of a conspiracy, bad bosses or bad weather.
Finally - one observation. One who has never sinned is less reliable than he who has sinned once. And the man who was wrong a lot and often - but never made one and the same mistake twice, - more reliable than one who was not mistaken never.