Hmm... Never thought I'd see one of these threads. Interesting;
I have a handful of mottos, use the first two a lot. ;p
"If you can't live up to your dreams then why live at all?"
"If you have the chance to change the world, take it!"
"The sky's the limit."
And finally, "If you can't fix it with duct-tape, it can't be fixxed!" ~ Red Green