Stephen Hawking was 21 years one-time when he was diagnosed with motor neuron disease , a rare form of ALS .

Doctors   told him he   would only live for a few years .

More than 50 years afterward , he ’s now 73 and one of the foremost physicist alive — a professor at the   University of Cambridge , aninvestigator of ignominious hole ,   and the author of the bestselling script   " A abbreviated story of Time . "

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Here are 15 quotes record Hawking ’s approach to scientific discipline and to life in world-wide .

On handicap

" My advice to other disabled people would be , centre on things your disability does n’t prevent you doing well , and do n’t rue the thing it interfere with . Do n’t be disable in sprightliness , as well as physically . "

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[ The New York Times , 2011 ]

On priority

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

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[ " Stephen Hawking ’s Universe , "   1985 ]

On gratis will

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

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

On humor

" life sentence would be tragic if it were n’t funny . "

[ The New York Times Magazine , 2004 ]

On black hole

" If you startle into a smuggled hole , your mass DOE will be devolve to our creation but in a mangled form which contains the information about what you were like but in a state where it can not be well realise . It is like burning an encyclopedia . Information is not lose , if one observe the smoke and the ashes . But it is hard to read . "

[ Information Loss in Black Holes , 2005 ]

On the value of string possibility

" When we understand string theory , we will know how the existence began . It wo n’t have much effect on how we survive , but it is important to understand where we come from and what we can expect to find as we research . "

[ The Guardian , 2005 ]

On his IQ

" I have no melodic theme . mass who swash about their IQ are losers . "

On what he cerebrate about all day

" Women . They are a complete secret . "

[ The New Scientist , 2012 ]

On why he writes for a pop audience

" I put a quite a little of effort into write ' A Briefer History ' at a time when I was critically ill with pneumonia because I guess that it ’s important for scientists to explain their work , especially in cosmology . This now serve many questions once asked of religion . "

On the Eureka here and now of a Modern discovery

" I would n’t compare it to sex , but it last longer . "

[ Lecture at Arizona State University , 2011 ]

His advice to his three child

" One , remember to take care up at the mavin and not down at your foot . Two , never give up work . employment gives you meaning and purpose , and living is empty without it . Three , if you are lucky enough to find love , remember it is there and do n’t throw it away . "

[ ABC News , 2010 ]

On aliens

" If extraterrestrial visit us , the outcome would be much as when Columbus set ashore in America , which did n’t turn out well for the Native Americans . We only have to look at ourselves to see how intelligent lifetime might rise into something we would n’t desire to meet . "

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

On his wellness

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

[ CNN , 2010 ]

On God

" God may exist , but skill can explicate the creation without a need for a creator . "

On hit barrier

" It is no good getting raging if you get stuck . What I do is keep thinking about the trouble but work on something else . Sometimes it is years before I see the way forward . In the casing of information loss and smuggled kettle of fish , it was 29 years . "

Read next on Business Insider : Here ’s what Eddie Redmayne , who played Stephen Hawking in ' The Theory of Everything , ' said about his dying