I only went out for a walk and finally concluded to stay out till sundown, for going out, I found, was really going in. ~John Muir, 1913, in L.M. Wolfe, ed., John Muir, John of the Mountains: The Unpublished Journals of John Muir, 1938
Thank God men cannot fly, and lay waste the sky as well as the earth. ~Henry David Thoreau
I would feel more optimistic about a bright future for man if he spent less time proving that he can outwit Nature and more time tasting her sweetness and respecting her seniority. ~Elwyn Brooks White, Essays of E.B. White, 1977