Energy and persistence conquer all things.
Benjamin Franklin (1706 - 1790)
Nothing in the 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. The slogan 'Press On' has solved and always will solve the problems of the human race.
Calvin Coolidge (1872 - 1933)
You must keep sending work out; you must never let a manuscript do nothing but eat its head off in a drawer. You send that work out again and again, while you're working on another one. If you have talent, you will receive some measure of success - but only if you persist.
Isaac Asimov (1920 - 1992)
That which we persist in doing becomes easier, not that the task itself has become easier, but that our ability to perform it has improved.
Ralph Waldo Emerson (1803 - 1882)
We are made to persist. That's how we find out who we are.
Tobias Wolff, 'In Pharaoh's Army'