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

"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."

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

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

"Common sense is not so common."

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

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