"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 sarcastic person is a person who is not only witty but also wise."

"I have never met a man so ignorant that I couldn't learn something from him."

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

"An eye for an eye only ends up making the whole world blind."

"Angry people are not always wise."