"Time you enjoyed wasting is not wasted time." (Procrastinator's anthem. )
~Bertrand Russel
"Spiral out and keep going." *insert guitar solo*
~James Maynard Keenan, singer of Tool, in song Lateralus.
(The second one is serious, by the way. It means to keep branching out rather than staying within your normal boundaries. It's more recent of a quote-to-live-by than the first one, though.)
"A man once asked Buddha 'I want happiness'. Buddha said 'First remove "I", that's ego. Then remove "want", that's desire. See, now you are left with "Happiness'""
-Buddha. (I may not be a Buddhist but damn he has some good quotes.