A man who thinks he can

If you think you are beaten, you are,
If you think that you dare not, you don't,
If you'd like to win, but you think you can't,
It's almost certain you won't.

If you think you'll lose, you've lost,
For out in the world you'll find,
Success begins with a fellow's will,
It's all in the state of mind.

If you think you are outclassed,you are,
You've got to think high to rise,
You've got to be sure of yourself before
You can ever win a prize.

Life's battles don't always go
To the stronger or faster man,
But soon or late the man who wins
Is the man who thinks he can.

This is a poem which hangs on the wall of the office of the great golfer Arnold Palmer. Quoted by Juha Akras in a True Nokia leader video.