“When you're winning, keep working like you're losing.”
“You're never as good as everyone tells you when you win, and you're never as bad as they say when you lose.”
“You're never as good as you think you are when you win; and you're never as bad as you feel when you lose.”
“If you're not big enough to lose, you're not big enough to win.”
“About the only time losing is more fun than winning is when you're fighting temptation.”
“If you're keeping score, win.”