Quotes from the Great Roger Penn:
"Mathematics is the art of finding the right answer, but only after you've spent 4 hours trying to solve for x."
"I once spent 2 weeks trying to prove that pi was a rational number. My wife said I was irrational."
"A mathematician who doesn't have a good understanding of fractals is like a painter who doesn't know color theory."
Other quotes from Roger Penn's collection can be found at /quotes