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

"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."

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

"Silence is a source of great strength."

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

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

"The mind is everything. What you think you become."