"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."

"Non-violence is a weapon of the strong."

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

"Non-violence is the weapon of the strong."

"Non-violence is the greatest force at the disposal of mankind."