Keep away from people who try to belittle your ambitions. Small people always do that, but the really great make you feel that you, too, can become great.
Mark Twain
There is one quality which one must possess to win, and that is definiteness of purpose, the knowledge of what one wants, and a burning desire to possess it.
Napoleon Hill
The starting point of all achievement is desire.
Whenever a man has cast a longing eye on offices, a rottenness begins in his conduct.
Thomas Jefferson
Far and away the best prize that life has to offer is the chance to work hard at work worth doing.
Theodore Roosevelt