At least two-thirds of our miseries spring from human stupidity, human malice and those great motivators and justifiers of malice and stupidity: idealism, dogmatism and proselytising zeal on behalf of religious or political ideas.

Aldous Huxley

I’m not that sure where he got his figures from, but this echoes what I’ve been saying for so long it makes me think I must have read it somewhere before. It’s a very compelling argument for not taking anything too seriously.