The Symposium (Banquet of the Ten Virgins)

It still remains to speak concerning the concubines. To those who lived after the deluge the knowledge of God was henceforth more remote, and they needed other instruction to ward off the evil, and to be their helper, since idolatry was already creeping in. Therefore God, that the race of man might not be wholly destroyed, through forgetfulness of the things which were good, commanded His own Son to reveal to the prophets His own future appearance in the world by the flesh, in which the joy and knowledge of the spiritual eighth day shall be proclaimed, which would bring the remission of sins and the resurrection, and that thereby the passions and corruptions of men would be circumcised. And, therefore, He called by the name of the eighty virgins the list of the prophets from Abraham, on account of the dignity of circumcision, which embraces the number eight, in accordance with which also the law is framed; because they first, before the Church was espoused to the Word, received the divine seed, and foretold the circumcision of the spiritual eighth day.