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

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

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

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

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

"Patience is the companion of wisdom."

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

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