" It turns out, however, that there is a profound obstacle to testing, a barrier that prevents many of us from harnessing the upsides of the evolutionary process. It can be summarized simply, although the ramifications are surprisingly deep: we are hardwired to think that the world is simpler than it really is. And if the world is simple, why bother to conduct tests? If we already have the answers, why would we feel inclined to challenge them? "

― Matthew Syed , Black Box Thinking: Why Some People Never Learn from Their Mistakes - But Some Do