" They, then, who are able also to fight for us are able to guard the fruit that is in us. And for you, holy virgins, there is a special guardianship, for you who with unspotted chastity keep the couch of the Lord holy. And no wonder if the angels fight for you who war with the mode of life of angels. Virginal chastity merits their guardianship whose life it attains to. "

― Ambrose of Milan , Concerning Virgins