My first ever boss in sales gave me a plaque with this quote on it:
"Nothing in this world can take the place of persistence. Talent will not: nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not: the world is full of educated derelicts. Persistence and determination alone are omnipotent."
Calvin Coolidge - 30th US President, 1923 -- 1929.