“I’m not really afraid of total failure, because I don’t think that will happen. I’m not afraid of success, because that beats the hell out of failure. It’s being in the middle that scares me. I’ve done some mediocre stuff, and it really bothers me. Having to live with mediocrity is pretty scary.”
tumblr’s attributing the quote to RDJ, but I can’t find a source for it. Anyway, it’s TRUE.