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

Through perseverance many people win success out of what seemed destined to be certain failure.
Benjamin Disraeli

The season of failure is the best time for sowing the seeds of success.
Paramahansa Yogananda

Success represents the 1% of your work which results from the 99% that is called failure.
Soichiro Honda