"Extremism thrives amid ignorance and anger, intimidation and cowardice."

"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."

"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."

"Angry people are not always wise."

"How clever you are, to know something of which you are ignorant."