If you wish to succeed in life, make perseverance your bosom friend, experience your wise counselor, caution your elder brother, and hope your guardian genius.
It’s interesting how the most powerful things are often the most simple. This is a longer quote on perseverance itself that is probably my favorite:
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 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 (30th President of the US, 1923-1929)