Most things that we and the people around us do constantly... have come to seem so natural and inevitable that merely to pose the question, 'Why are we doing this?' can strike us as perplexing - and also, perhaps, a little unsettling. On general principle, it is a good idea to challenge ourselves in this way about anything we have come to take for granted; the more habitual, the more valuable this line of inquiry.

-Alfie Kohn, "Punished By Rewards"