The motivational poster on my bedroom wall says this:

“If you think you are beaten, you are.
If you think you dare not, you’re right.
If you like to win, but you think you can’t,
It is almost certain you won’t.

If you think you’ll lose, you’ve lost.
For out of the world we find,
Success begins with a person’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 sooner or later the man who wins
is the man who thinks he can.”

~ Author Unknown