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Hitherto man had to live with the idea of death as an individual; from now onward mankind will have to live with the idea of its death as a species.

Arthur Koestler (1981). “Kaleidoscope: essays from Drinkers of infinity, and The heel of Achilles and later pieces and stories”, Vintage
Hitherto man had to live with the idea of death as an individual; from now onward mankind will have to live with the idea of its death as a species.