hmm...I've known lots of quotes I like and can't bring them all to my head right now, but all the ones that have been listed so far are so great. I guess I like these ones too:

"Better to ask forgiveness than permission" --haha a good way to get yourself into trouble

"Three parts Brave, one part fool."

"Live life to the fullest"

...oh man right now I can't remember any more.