"I would like to know the mind of God—everything else is details."

"The world is a very dangerous place, not because of those who do evil, but because of those who look on and do nothing."

"The universe is not just full of black holes, it's full of black holes that are eating everything."

"The downside of my celebrity is that I cannot go anywhere in the world without being recognized. It is not enough for me to wear dark sunglasses and a wig. The wheelchair gives me away."

"I think that the human race has a future, but it's going to be a challenging one."