endless duration

See: perpetuity
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References in classic literature ?
Thus saith Cide Hamete the Mahometan philosopher; for there are many that by the light of nature alone, without the light of faith, have a comprehension of the fleeting nature and instability of this present life and the endless duration of that eternal life we hope for; but our author is here speaking of the rapidity with which Sancho's government came to an end, melted away, disappeared, vanished as it were in smoke and shadow.
The question of infinity and time is treated as a minor theme or spatialized as Einsteinian space/time, and the important qualitative distinctions between endless duration and eternity are not addressed.