The Corpus Hermeticum

Wherefore child-making is a very great and a most pious thing in life for them who think aright, and to leave life on earth without a child a very great misfortune and impiety; and he who hath no child is punished by the daimones after death.

And this is why beyond all creatures on the earth man is twofold; mortal because of body, but because of the essential man immortal.

Though deathless and possessed of sway o'er all, yet doth he suffer as a mortal doth, subject to Fate