It is appropriate that we should receive the body of Christ in the form of bread, because, as there are many grains of wheat in the flour from which bread is made by mixing it with water and baking it with fire, so also we know that many members make up the one body of Christ which is brought to maturity by the fire of the Holy Spirit… Similarly, the wine of Christ’s blood, drawn from the many grapes of the vineyard that he had planted, is extracted in the wine-press of the cross. When men receive it with believing hearts, like capacious wineskins, it ferments within them by its own power.
–Saint Gaudentius of Brescia (d. 410)