"Common sense is not so common."

"To know what you know and what you do not know, that is true knowledge."

"In a gentle way, you can shake the world."

"Judge a man by his questions rather than his answers."

"The only thing we have to fear is fear itself."

"He who has a why to live can bear almost any how."

"It is not that I'm so smart. But I stay with the questions much longer."

"A wise man can learn more from a foolish question than a fool can learn from a w..."