Walter D. Wintle said this quote

“ If you think you are beaten, you areIf you think you dare not, you don't,If you like to win, but you think you can'tIt is almost certain you won't.If you think you'll lose, you're lostFor out of the world we find,Success begins with a fellow's willIt's all in the state of mind.If you think you are outclassed, you areYou've got to think high to rise,You've got to be sure of yourself beforeYou can ever win a prize.Life's battles don't always goTo the stronger or faster man,But soon or late the man who winsIs the man WHO THINKS HE CAN! ”