"the womb of the virginal font"

Peter Trimming

"the heavenly Spirit, by the mysterious infusion of his light, gives fertility to [(fecundat)] the womb of the virginal font [(uirgineum fontis uterum, the virginal womb of the font)]. The Spirit brings forth as men belonging to heaven those whose earthly ancestry brought them forth as men belonging to the earth, and in a condition of wretchedness; he gives them the likeness of their Creator. Now that we are reborn, refashioned in the image of our Creator, we must fulfill what the Apostle commands: So, as we have worn the likeness of the man of earth, let us also wear the likeness of the man of heaven."

     St. Peter Chrysologus, Sermon 117.4 on 1 Cor 15:45-50, as trans. Liturgy of the hours.  =CCSL 24a, 711, ll. 48 ff. (of the sermon).  =PL 52, col. 521B (where virginei, which would modify fontis rather than uterum, does not appear among the varient readings in the apparatus to CCSL 24a).  The translation by Gans ((FC 17), 201) is more restrictive because less literal.  For "Mother" is not present precisely here:

"the heavenly Spirit by a mysterious injection of His light fecundates [(fecundat)] the womb of the virginal Mother [(uirgineum fontis uterum)]. He desired to bring forth as heavenly beings those whom an origin from an ancestral stock of earth had brought forth as earthy men, in a wretched state. He wanted to bring them to the likeness of their Creator. So, let us who have already been reborn, and reformed to the image of our Creator, fulfill what the Apostle commands.
     "'Therefore, even as we have borne the likeness of the earthy, let us bear also the likeness of the heavenly.'"