Quit now, you will never make it. You do not know what you cannot do. When one door closes another opens.

Self-image sets the boundaries of individual accomplishment.
I do not believe in circumstances.

Until you try, you do not know what you cannot do. An objective without a plan is a dream.

One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man. Quit now, you will never make it.

You cannot pick cherries with your back to the tree. I do not seek. I find.

Do not let yourself indulge in vain wishes. You cannot cross the sea merely by standing and staring at the water.

A thousand-mile journey begins with one step.