"I believe that the universe is infinite, and that there are an infinite number of universes."

"I believe that we are alone in the universe, or that we are the only intelligent life."

"I don't think anyone would take me f---ing seriously if I sounded like that."

"I am an optimist, but I am a realist who understands that science is a slow process."

"The fact that we humans, who are ourselves mere collections of fundamental particles, have been able to come this close to an understanding of the laws governing us and our universe is a great triumph…"