Carl Sagan Quotes about Humility
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Keynote address at CSICOP conference in 1987. "Do Science and the Bible Conflict?" Book by Judson Poling, p. 30, 2003.
Carl Sagan, Ann Druyan (2011). “Pale Blue Dot: A Vision of the Human Future in Space”, p.41, Ballantine Books
Carl Sagan (1994). “Pale Blue Dot: A Vision of the Human Future in Space”, Random House Incorporated