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

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

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

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

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

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

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

"Knowing yourself is the beginning of all wisdom."