35 And how was it, you will say, that they did not recognize Him on the road if He had the same body which He had before? Let me recall what Scripture says: “Their eyes were holden, that they might not know Him.” And again, “Their eyes were opened, and they knew Him.” Was He one person when He was not known, and another when He was known? He was surely one and the same. Whether, therefore, they knew Him, or not, depended on their sight; it did not depend upon Him Who was seen; and yet it did depend on Him in this sense, that He held their eyes that they might not know Him.
Lastly, that you may see that the mistake which held them was not to be attributed to the Lord's body, but to the fact that their eyes were closed, we are told: “Their eyes were opened, and they knew Him.” Wherefore, also, Mary Magdalene so long as she did not recognize Jesus, and sought the living among the dead, thought He was the gardener. Afterwards she recognized Him and then she called Him Lord. After His resurrection Jesus was standing on the shore, His disciples were in the ship.
When the others did not know Him, the disciple whom Jesus loved said to Peter, “It is the Lord.” For virginity is the first to recognize a virgin body. He was the same, yet was not seen alike by all as the same. And immediately it is added, “And no one dared ask Him, Who are You? For they knew that He was the Lord.” No one dared, because they knew that He was God. They ate with Him at dinner because they saw He was a man and had flesh; not that He was one person as God, another as man: but, being one and the same Son of God, He was known as man, adored as God.
I suppose I must now air my philosophy, and say that our senses are not to be relied on, and especially sight. A Carneades must be awaked from the dead to tell us the truth— that an oar seems broken in the water, porticos afar off look more magnificent, the angles of towers seem rounded in the distance, that the backs of pigeons change their colours with every movement. When Rhoda announced Peter, and told the Apostles, they did not believe that he had escaped, on account of the greatness of the danger, but suspected it was a phantom.
Moreover, in passing through closed doors, He exhibited the same power as in vanishing out of sight. Lynceus, as fable relates, used to see through a wall. Could not the Lord enter when the doors were shut, unless He were a phantom? Eagles and vultures perceive dead bodies across the sea. Shall not the Saviour see His Apostles without opening the door? Tell me, sharpest of disputants, which is greater, to hang the vast weight of the earth on nothing, and to balance it on the changing surface of the waves; or that God should pass through a closed door, and the creature yield to the Creator?
You allow the greater; you object to the less. Peter walked upon the waters with his heavy and solid body. The soft water does not yield: his faith doubts a little, and immediately his body understands its own nature; that we may know that it was not his body that walked on the water, but his faith.
Source: To Pammachius Against John of Jerusalem (New Advent)