...[M]ay Christ help us, the Son of a virgin, and the Spouse of virgins, born after the flesh of a virgin womb, and wedded after the Spirit in virgin marriage. Whereas, therefore, the whole Church itself is a virgin espoused unto one Husband Christ, as the Apostle says, of how great honor are its members worthy, who guard this even in the flesh itself, which the whole Church guards in the faith? Which imitates the mother of her husband, and her Lord. For the Church also is both a mother and a virgin. For whose virgin purity consult we for, if she is not a virgin? Or whose children address we, if she is not a mother? Mary bare the Head of This Body after the flesh, the Church bears the members of that Body after the Spirit. In both virginity hinders not fruitfulness: in both fruitfulness takes not away virginity.
Augustine, On Holy Virginity, sect. 2.
