"To understand at all what life means, one must begin with Christian belief. And I think knowledge may be sorrow with a man unless he loves."

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Science can't tell us what our life means ethically. It can't tell us what we are meant to do as moral creatures. But, insofar as science can understand what we're made of, and what we're related to, the Darwinian revolution completely revised our ideas about who we are and what we're related to and how long we've been here and why we're on this Earth.

— Stephen Jay Gould