Emile M. Cioran

If you're a filmmaker, and every time you finish a film, you just naturally go, 'Oh, I could have done so much better,' that's not much fun, is it, really? You might as well go pick another profession if that really is how you derive satisfaction from it.

It is only when you watch the dense mass of thousands of ants, crowded together around the Hill, blackening the ground, that you begin to see the whole beast, and now you observe it thinking, planning, calculating. It is an intelligence, a kind of live computer, with crawling bits for its wits.

Sometimes it's even hard to tell the difference between a tic and a compulsion. But while tics stem from an urge in a specific part of the body - either completely unconsciously or through a premonitory sensation that's satisfied only by the tic - OCD bubbles up as conscious thoughts in the mind.