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

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

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

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

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

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

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

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