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

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

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

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

"Silence is a source of great strength."

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

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

"Patience is the companion of wisdom."