The Man Who Thinks He Can

I am at page 47 of Napoleon Hill's old book "Think and Grow Rich". Just saw this verse which I feel is the theme of the book. I heard that the Chinese version of this book has once token Chinese readers by storm. 

“If you think you are beaten, you are;
If you think you dare not, you don't.
If you'd like to win, but think you can't
It's almost a cinch you won't.

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

If you think you're outclassed, you are:
You've got to think high to rise,
You've got to be sure of yourself before
You'll ever win that prize.

Life's battles don't always go
To the stronger or faster man,
But sooner or later the man who wins
Is the one who thinks he can. ”