"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."

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

"The only thing I know is that I know nothing."

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

"By three methods we may learn wisdom: first, by reflection, which is noblest; se..."

"The fool doth think he is wise, but the wise man knows himself to be a fool."

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