Ambrose of Milan : All those who ate that bread [manna] died in the desert, but this food which you receive, this "living bread which came down from heaven," furnishes the energy for eternal life. Whoever eats this bread "will not die forever," for it is the body of Christ. … That manna was subject to corruption if kept for a second day. This is foreign to every corruption. Whoever tastes it in a holy manner shall not be able to feel corruption. For them water flowed from the rock. For you blood flows from Christ. Water satisfied them for the hour. Blood satisfies you for eternity. — On the Mysteries 8.48 Ambrose of Milan : What we eat, what we drink, the Holy Spirit expresses to you elsewhere, saying; "Taste and see that the Lord is sweet. Blessed is the one who trusts in him." Christ is in that sacrament, because the body is Christ's. So the food is not corporeal but spiritual. — On the Mysteries 56 Gregory of Nyssa : The divine apostle also, in calling the Lord "spiritual food and drink," suggests that he knows that human nature is not simple, but that there is an intelligible part mixed with a sensual part and that a particular type of nurture is needed for each of the elements in us—sensible food to strengthen our bodies and spiritual food for the well-being of our souls. — ON PERFECTION Theodore of Mopsuestia : Paul calls the food supernatural because it gave those who ate it the power of the Holy Spirit. However, it did not of itself make them spiritual people. — PAULINE COMMENTARY FROM THE GREEK CHURCH