The best advice/statement i have heard recently was by my professor for a teaching class. I am working on a degree towards teaching, and we were talking about giving praise to your students and how not to over use words/phrases. Anyway to make a long story short this is what he said.
Give me my flowers so that i may enjoy them now, not when I'm six feet under.
Another one i have grown up to follow is the following:
A quitter never wins, and a winner never quits!
And last one which is my personal FAVORITE!
Failure is not succeeding, failure is never trying in the first place