"Silence is a source of great strength."

"In a gentle way, you can shake the world."

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

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

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

"Common sense is not so common."

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

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