Theophylact of Ohrid

This bread, however, is not such, but abides forever, so that they, if they wish, will receive blessings far greater than their fathers. How is that which is granted by Christ not greater? For although everyone will taste death, yet he is alive by the hope of the resurrection.

Commentary on John ↗

Augustine of Hippo

"This is the bread which cometh down from heaven." Manna signified this bread; God's altar signified this bread. Those were sacraments. In the signs they were diverse; in the thing which was signified they were alike. Hear the apostle: "For I would not that ye should be ignorant, brethren," saith he, "that all our fathers were under the cloud, and all passed through the sea; and were all baptized unto Moses in the cloud and in the sea; and did all eat the same spiritual meat." Of course, the same spiritual meat; for corporally it was …

Tractates on John 26 ↗

Ambrose of Milan

We are able to receive the Lord Himself, who gave His flesh for us, as He Himself says: "I am the bread of life. Your fathers ate the manna in the desert, and they died: but this is the bread which comes down from heaven, that if any man eat of it, he may not die" (John 6:48-50). …

On the Blessings of the Patriarchs 9.39 ↗

Thomas Aquinas

Having presented the argument, he draws the conclusion: This is the bread that comes down from heaven. He says, This, the Gloss says, to indicate himself. But our Lord does not understand it this way as it would be superfluous, since he immediately adds, I am the living bread that has come down from heaven. So we should say that our Lord wants to say that the bread which can do this, i.e., give life, comes from heaven; but I am that bread: thus, I am that bread that comes down from heaven. …

Commentary on John ↗