"We don't see things as they are, we see them as we are."

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

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

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

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

"Common sense is not so common."

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

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