"One, remember to look up at the stars and not down at your feet. Two, never give up work. Work gives you meaning and purpose and life is empty without it. Three, if you are lucky enough to find love, remember it is there and don't throw it away."
"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."
"why are we here?where do we come from?traditionally,these are questionsfor philosophy,but philosophy is dead"
"[In the Universe it may be that] Primitive life is very common and intelligent life is fairly rare. Some would say it has yet to occur on Earth."
"I hope I have helped to raise the profile of science and to show that physics is not a mystery but can be understood by ordinary people."
"It is not clear that intelligence has any long-term survival value."