"Christianity is no mere scheme of doctrine or of ethical practice, but is instead a kind of miracle, a power out of nature and above, descending into it; a historically supernatural movement on the world, that is visibly entered into it, and organized to be an institution in the person of Jesus Christ."

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The choice, as Wells once said, is the Universe-or nothing. . . . The challenge of the great spaces between the worlds is a stupendous one; but if we fail to meet it, the story of our race will be drawing to its close. Humanity will have turned its back upon the still untrodden heights and will be descending again the long slope that stretches, across a thousand million years of time, down to the shores of the primeval sea.

— Arthur C. Clarke