God the Father arranged the nuptials for God, His Son, when, in the womb of the Virgin, He united Him to humanity, when He willed that He who is God before all the ages, become Man.
He united the Holy Church to Him, through the mystery of the incarnation.
Now, the bridal chamber of this Bridegroom was the womb of the Virgin Mother. That is why the Psalmist says, "He has set His tabernacle in the sun: and He is as a Bridegroom coming out of His bridal chamber" Ps. 18:6 (DRA). And it was as a Bridegroom is in fact that He came forth from His bridal chamber, because to unite the Church to Himself, the Incarnate God went forth from the inviolate womb of the Virgin.
Pope Gregory The Great