“To avoid criticism say nothing, do nothing, be nothing.”

“Nothing is permanent but change.”

“The final proof of greatness lies in being able to endure criticism without resentment.”

“The world is moving so fast these days that the man who says it can't be done is generally interrupted by someone doing it.”

“Self-discipline is the ability to make yourself do what you should do, when you should do it, whether you feel like it or not.”

“It does not take much strength to do things, but it requires a great deal of strength to decide what to do.”

“One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man. ”