"A thousand years ago, everybody knew the Earth was the center of the universe. Five hundred years ago, they knew the Earth was flat. Fifteen minutes ago, you knew we humans were alone on it. Imagine what you'll know tomorrow."

"A little knowledge is a dangerous thing. Drink deep, or taste not the Pierian spring."

"To be truthful, you must be non-violent."

"It is one thing to be non-violent in peace, and another to be non-violent in the face of violence."

"I am convinced that the law of non-violence has come to stay."

"To regret one’s own experiences is to arrest one’s own development. To deny one’s own experiences is to put a lie into the lips of one’s own life. It is no less than a denial of the soul."