Let us use the examples He [Jesus] gives, and by the example of the Incarnation, let us prove the truth of the mystery. Did the course of nature proceed as usual when the Lord Jesus was born of Mary? If we look to the usual course, a woman ordinarily conceives after connection with a man. And this body which we make is that which was born of the Virgin. Why do you seek the order of nature in the Body of Christ, seeing that the Lord Jesus Himself was born of a Virgin, not according to nature? It was the true Flesh of Christ that was crucified and buried; therefore this is truly the Sacrament of His Body. The Lord Jesus Himself proclaims: “This is My Body.” Before the blessing of the heavenly words, another nature is spoken of; after the consecration the Body is signified. He Himself speaks of His Blood. And you say, “Amen”, that is, “It is true”. Let the heart within confess what the mouth utters, let the soul feel what the voice speaks (On the Mysteries, 9.53-54).