"The measure of intelligence is the ability to change."

"Silence is a source of great strength."

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

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

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

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

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

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