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 – American politician, 1923-1929 30th president (1872-1933), Quotations book 2015