From Patrick Henry Reardon’s book Reclaiming the Atonement: An Orthodox Theology of Redemption (Volume 1 of 3: The Incarnate Word).
The Divine Liturgy, we may say, is the oven of the Holy Spirit. That grain of wheat which was sown in the earth on Good Friday sprang forth as the infinite paschal harvest and now abides forever in the granary of heaven. Christ our Lord is not content, however, simply to abide in His glorified Body. In this Body, Christ can be found in only one place. He is needed, however, in many places, and this is the reason He provided a new, sacramental mode of presence. In the Holy Eucharist, He lives on thousands of altars at once, available—edible!—for the myriads of believers who draw near in the fear of God and with faith and love.
In the mystery of the Holy Eucharist, the wheat, which is Christ’s glorified Body, is baked in the oven of the Holy Spirit, so that the nutritive energies of God may pass into those who receive Him in faith. Through the cells and sinews of our own flesh there course those divine energies that transform and deify our bodies and souls—our whole being—with the power, the dynamis, of immortality.