John Calvin Coolidge, Jr. (July 4, 1872 – January 5, 1933) was the 30th President of the United States (1923–29).
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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.