If I had permitted my failures, or what seemed to me at the time a lack of success, to discourage me I cannot see any way in which I would ever have made progress.
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Nothing in this world can take the place of persistence. Talent will not; nothing is more common than unsuccessful people with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated failures. Persistence and determination alone are omnipotent.