15 Stephen Hawking quotes that reveal how a genius thinks

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On disability

On disability

"My advice to other disabled people would be, concentrate on things your disability doesn’t prevent you doing well, and don't regret the things it interferes with. Don’t be disabled in spirit, as well as physically."

[The New York Times, 2011]

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On priorities

On priorities

"My goal is simple. It is a complete understanding of the universe, why it is as it is and why it exists at all."

["Stephen Hawking's Universe," 1985]

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On free will

On free will

"I have noticed that even people who claim everything is predetermined and that we can do nothing to change it, look before they cross the road."

["Black Holes and Baby Universes and Other Essays," 1994]

On humor

On humor

"Life would be tragic if it weren't funny."

[The New York Times Magazine, 2004]

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On black holes

On black holes

"If you jump into a black hole, your mass energy will be returned to our universe but in a mangled form which contains the information about what you were like but in a state where it can not be easily recognized. It is like burning an encyclopedia. Information is not lost, if one keeps the smoke and the ashes. But it is difficult to read."

[Information Loss in Black Holes, 2005]

On the value of string theory

On the value of string theory

"When we understand string theory, we will know how the universe began. It won't have much effect on how we live, but it is important to understand where we come from and what we can expect to find as we explore."

[The Guardian, 2005]

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On his IQ

On his IQ

"I have no idea. People who boast about their IQ are losers."

[The New York Times Magazine, 2004]

On what he thinks about all day

On what he thinks about all day

"Women. They are a complete mystery."

[The New Scientist, 2012]

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On why he writes for a popular audience

On why he writes for a popular audience

"I put a lot of effort into writing 'A Briefer History' at a time when I was critically ill with pneumonia because I think that it's important for scientists to explain their work, particularly in cosmology. This now answers many questions once asked of religion."

[The Guardian, 2005]

On the Eureka moment of a new discovery

On the Eureka moment of a new discovery

"I wouldn't compare it to sex, but it lasts longer."

[Lecture at Arizona State University, 2011]

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His advice to his three children

His advice to his three children

"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."

[ABC News, 2010]

On aliens

On aliens

"If aliens visit us, the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans. We only have to look at ourselves to see how intelligent life might develop into something we wouldn't want to meet."

["Into the Universe with Stephen Hawking," 2010]

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On his health

On his health

"When I was first diagnosed with ALS, I was given two years to live. Now 45 years later, I am doing pretty well."

[CNN, 2010]

On God

On God

"God may exist, but science can explain the universe without a need for a creator."

[CNN, 2010]

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On hitting roadblocks

On hitting roadblocks

"It is no good getting furious if you get stuck. What I do is keep thinking about the problem but work on something else. Sometimes it is years before I see the way forward. In the case of information loss and black holes, it was 29 years."

[The Guardian, 2005]