"Silence is a source of great strength."

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

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

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

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

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

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

"A wise man can learn more from a foolish question than a fool can learn from a w..."