Then, again, how can they say that the flesh, which is nourished with the body of the Lord
and with His blood, goes to corruption, and does not partake of life? Let them, therefore, either
alter their opinion, or cease from offering the things just mentioned. But our opinion is in
accordance with the Eucharist, and the Eucharist in turn establishes our opinion. For we offer to
Him His own, announcing consistently the fellowship and union of the flesh and Spirit. For as
the bread, which is produced from the earth, when it receives the invocation of God, is no longer
common bread, but the Eucharist, consisting of two realities, earthly and heavenly; so also our
bodies, when they receive the Eucharist, are no longer corruptible, having the hope of the resurrection
to eternity (Adv Haereses IV.18.5).
This is before all the philosophically oriented fights of the Reformation. As always, this genial Church father takes us deep in the meaning of the things of God. The closest biblical parallel is John 6.