There is no law by which you can achieve success in anything without expecting it, demanding it, assuming it. There must be a strong, firm self-faith first, or the thing will never come. There is no room for chance in God’s world of system and supreme order. Everything must have not only a cause-but a sufficient cause-a cause as large as the result. A stream cannot rise higher than its source. A great success must have a great source in expectation, in self-confidence, and in persistent endeavor to attain it. No matter how great the ability, how large the genius or how splendid the education, the achievement will never rise higher than the confidence. He can who thinks he can, and he can’t who thinks he can’t. This is an inexorable, indisputable law.
It does not matter what other people think of you, of your plans or of your aims. No matter if they call you a visionary, a crank, or a dreamer; you must believe in yourself. You forsake yourself when you lose your confidence. Never allow anybody or any misfortune to shake your belief in yourself.
-excerpt from Successful Achievement