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

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

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

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

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

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

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

"Common sense is not so common."