"The past, like the future, is indefinite and exists only as a spectrum of possibilities."

"I'm an optimist. I think that the human race will find a way to survive."

"The universe is a beautiful and dangerous place, and I'm glad to be a part of it."

"The human race is just a chemical scum on a moderate-sized planet, orbiting around a very average star in the outer suburb of one among a hundred billion galaxies."

"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."