“All my life, I have been fascinated by the big questions that face us, and have tried to find scientific answers to them.”
From the 1997 television program Stephen Hawking's Universe http://www.pbs.org/wnet/hawking/html/home.html
Unsourced variant: All of my life, I have been fascinated by the big questions that face us, and have tried to find scientific answers to them. Perhaps that is why I have sold more books on physics than Madonna has on sex. This quote seems to combine the above sentence from Stephen Hawking's Universe with a statement from the Foreword to The Illustrated Brief History of Time: As Nathan Myhrvold of Microsoft (a former post-doc of mine) remarked: I have sold more books on physics than Madonna has on sex.
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British theoretical physicist, cosmologist, and author 1942–2018Related quotes
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Focus Fourteen

“I have had a life in which I have had to face every big fear, and it has not been pleasant.”
cubanet.org (May 15, 2000)
2007, 2008

“My whole life is waiting for the questions to which I have prepared answers.”
Source: Lord Malquist and Mr Moon (1966), Ch. 2: A Couple of Deaths and Exits.

“Simple answers to life’s questioning. That would be a magic beyond any I have ever been seeing.”
Source: Memory, Sorrow, and Thorn, Stone of Farewell (1990), Chapter 8, “On Sikkihoq’s Back” (p. 188).

“For the first time in my life I find myself with more than one answer to the same question.”
Source: Deathworld (1960), p. 113
Context: "What about it, Meta?" he snapped. "No doubts? Do you think that destruction is the only way to end this war?"
"I don't know," she said. "I can't be sure. For the first time in my life I find myself with more than one answer to the same question."
"Congratulations," he said. "It's a sign of growing up."

Assorted Themes, On the Meaning of Life

As quoted in "Ben Carson: Big Bang A Fairy Tale, Theory Of Evolution Encouraged By The Devil" http://www.buzzfeed.com/andrewkaczynski/ben-carson-big-bang-a-fairy-tale-theory-of-evolution-encoura#.scwEnmYlG, Buzzfeed News (September 22, 2015)