The day following, when the people who stood on the other side of the sea saw that there was no other boat there, except that one into which his disciples were entered, and that Jesus went not with his disciples into the boat, but that his disciples were gone away alone;
All Commentaries on John 6:22 Go To John 6
Alcuin of York
AD 804
He who set an example of declining praise, and earthly power, sets teachers also an example of deliverance in preaching.
Bodily food only supports the flesh of the outward man, and must be taken not once for all, but daily; whereas spiritual food remains for ever, imparting perpetual fullness, and immortality.
When, through the hand of the priest, you receive the Body of Christ, think not of the priest which you see, but of the Priest you do 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 has 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 has sealed Me, i.e. given Me something peculiar, to the end that should not be confounded with the human race, but that the human race should be delivered by Me.
To take the passage mystically: on the day following, i.e. after the ascension of Christ, the multitude standing in good works, not lying in worldly pleasures, expects Jesus to come to them. The one ship is the one Church: the other ships which come besides, are the conventicles of heretics, who seek their own, not the things of Jesus Christ. Wherefore He well says, You seek Me, because you did eat of the loaves.