"Knowing yourself is the beginning of all wisdom."

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

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

"Silence is a source of great strength."

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

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

"It is the mark of an educated mind to be able to entertain a thought without acc..."

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