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

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

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

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

"Knowing yourself is the beginning of all wisdom."

"The only thing I know is that I know nothing."

"Judge a man by his questions rather than his answers."

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