Calvin Coolidge
Our real problem is not our strength today ; it is rather the vital necessity of action today to ensure strength tomorrow.
One rule of action more important than all others is consists in never doing anything that someone else can do for you.
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.