"The only true wisdom is in knowing you know nothing."

"Science is organized knowledge. Wisdom is organized life."

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

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

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

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

"Knowing yourself is the beginning of all wisdom."

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