from Antifragile, p. 74 (or about 2:40 into part 1 of the audio version):

Further, my characterization of a loser is someone who, after making a mistake, doesn't introspect, doesn't exploit it, feels embarrassed and defensive rather than enriched with a new piece of information, and tries to explain why he made the mistake rather than moving on. These types often consider themselves the "victims" of some larger plot, a bad boss, or bad weather.

Finally, a thought. He who has never sinned is less reliable than he who has only sinned once. And someone who has made plenty of errors - thought never the same error more than once - is more reliable than someone who has never made any.