
On other stars
Attributed by John Burroughs on the first page of his 1920 book Accepting The Universe
Attributed by Carl Sagan at a November 20, 1972 symposium on "Life Beyond Earth and the Mind of Man", held at Boston University
[Berendzen, Richard, ed., Life Beyond Earth and the Mind of Man, 1973, NASA Scientific and Technical Information Office, Washington, DC, LCCN 73-600150]
"Life Beyond Earth and the Mind of Man 1975", Google Video, c. 0:02:50, 2006-09-11 http://video.google.com/videoplay?docid=-8949469271181885482&q=owner%3Anara+type%3Anasa, Edited version of symposium, released by National Archives, under Google Video partnership http://www.archives.gov/google/.
Attributed
Variant: A sad spectacle. If they be inhabited, what a scope for misery and folly. It they be not inhabited, what a waste of space.