The quotation that highlights the man's ignorance to the danger is "Fifty degrees below zero was to him just precisely fifty degrees below zero" in paragraph 3.
"To Build a Fire" is a short story by Jack London in which the main character dies out of arrogance and ignorance. Warned not to go into the forest by himself when the temperatures are so low, the man still goes, but is unable to save himself.
The quotation that highlights his ignorance of the potential danger of nature is: "Fifty degrees below zero was to him just precisely fifty degrees below zero. That there should be anything more to it than that was a thought that never entered his head."
The quotation above shows that the man underestimates nature and overestimates his own abilities.
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