"Our planet is a lonely speck in the great enveloping cosmic dark.... There is perhaps no greater demonstration of the folly of human conceits than this distant image of our tiny world. To me, it underscores our responsibility to deal more kindly with one another and to preserve and cherish the pale blue dot, the one home we’ve ever known."

Carl Sagan

"Civilization exists by geological consent, subject to change at any time"

Will Durant