"To know what you know and what you do not know, that is true knowledge."

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

"Knowing yourself is the beginning of all wisdom."

"Patience is the companion of wisdom."

"Silence is a source of great strength."

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

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

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