"The president led us into the Iraq war on the basis of unproven assertions without evidence he embraced a radical doctrine of pre-emptive war unprecedented in our history and he failed to build a true international coalition."

"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."

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

"Sarcasm is the lowest form of wit but the highest form of intelligence."

"Indulge your imagination in every possible flight."