Glossa Ordinaria

Otherwise; On account of the glorification of the most holy Mary, she could not be known by Joseph until the birth; for she who had the Lord of glory in her womb, how should she be known? If the face of Moses talking with God was made glorious, so that the children of Israel could not look thereon, how much more could not Mary be known, or even looked upon, who bare the Lord of glory in her womb? After the birth she was known of Joseph to the beholding of her face, but not to be approached carnally.