"So remember to look up at the stars and not down at your feet. Try to make sense of what you see and hold on to that childlike wonder about what makes the universe exist."
"A theory is a good theory if it satisfies two requirements: it must accurately describe a large class of observations on the basis of a model that contains only a few arbitrary elements, and it must make definite predictions about the results of future observations."
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Source: A Brief History Of Time: From Big Bang To Black Holes. Book by Stephen Hawking, 1988.
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More quotes by Stephen Hawking
"Quiet people have the loudest minds."
"Intelligence is the ability to adapt to change."
"The thing about smart people is that they seem like crazy people to dumb people."
"It is my view that the simplest explanation is there is no God. No one created the universe and no one directs our fate. This leads me to a profound realization. There is probably no heaven, and no afterlife either. We have this one life to appreciate the grand design of the universe, and for that, I am extremely grateful."
"It is all right to make mistakes; nothing is perfect because with perfection, we would not exist."