“We didn’t know if it was humanly possible to reach the top of Mt. Everest.”
Sir Edmund Hillary : King Of The World
Context: We didn’t know if it was humanly possible to reach the top of Mt. Everest. And even using oxygen as we were, if we did get to the top, we weren’t at all sure whether we wouldn’t drop dead or something of that nature.
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Edmund Hillary 25
New Zealand mountaineer 1919–2008Related quotes
“People do not wander around and then find themselves at the top of Mount Everest.”

“One of the redeeming things about being an athlete is redefining what is humanly possible.”
As quoted in "What's Possible" in Fast Company (19 December 2007) http://www.fastcompany.com/articles/2001/04/al0401.html
Unsourced variant: Being a champion is redefining what's humanly possible.

“Everyone always did miss everyone else in this war, whenever it was humanly possible to do so.”
Homage to Catalonia (1938)
‘The Monster Squad’ Was Released 25 Years Ago Today: Fred Dekker Talks About the Film’s Reception and Anniversary https://www.slashfilm.com/the-monster-squad-was-released-25-years-ago-fred-dekker-talks/2/ (August 14, 2012)