Alcuin
Catena Aurea · Johannesevangelium 6
The day following, when the people which stood on the other side of the sea saw that there was none other boat there, save that one whereinto his disciples were entered, and that Jesus went not with his disciples into the boat, but that his disciples were gone away alone; (Howbeit there came other boats from Tiberias nigh unto the place where they did eat bread, after that the Lord had given thanks:) When the people therefore saw that Jesus was not there, neither his disciples, they also took shipping, and came to Capernaum, seeking for Jesus. And when they had found him on the other side of the sea, they said unto him, Rabbi, when camest thou hither? Jesus answered them and said, Verily, verily, I say unto you, Ye seek me, not because ye saw the miracles, but because ye did eat of the loaves, and were filled. Labour not for the meat which perisheth, but for that meat which endureth unto everlasting life, which the Son of man shall give unto you: for him hath God the Father sealed.
When, through the hand of the priest, thou receivest the Body of Christ, think not of the priest which thou seest, but of the Priest thou dost not see. The priest is the dispenser of this food, not the author. The Son of man gives Himself to us, that we may abide in Him, and He in us. Do not conceive that Son of man to be the same as other sons of men: He stands alone in abundance of grace, separate and distinct from all the rest: for that Son of man is the Son of God, as it follows, For Him hath God the Father sealed. To seal is to put a mark upon; so the meaning is, Do not despise Me because I am the Son of man,for I am the Son of man in such sort, as that the Father hath sealed Me, i. e. given Me something peculiar, to the end that I should not be confounded with the human race, but that the human race should be delivered by Me.