"The more I think of a people calmly developing, in regions excluded from our sight and deemed uninhabitable by our sages, powers surpassing our most disciplined modes of force, and virtues to which our life, social and political, becomes antagonistic in proportion as our civilisation advances - the more devoutly I pray that ages may yet elapse before there emerge into sunlight our inevitable destroyers."

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This is written in the elder days as the Earth rides close to the rim of eternity, edging nearer to the dying Sun, into which her two inner companions of the solar system have already plunged to a fiery death. The Twilight of the Gods is history; and our planet drifts on and on into that oblivion from which nothing escapes, to which time itself may be dedicated in the final cosmic reckoning.

— Clifford D. Simak