Gregory the Great
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.
(xxiii. Moral. [c. xxv.]) In their persons too our Lord condemns all those within the holy Church, who, when brought near to God by sacred Orders, do not seek the recompense of righteousness, but the interests of this present life. To follow our Lord, when filled with bread, is to use Holy Church as a means of livelihood; and to seek our Lord not for the miracle’s sake, but for the loaves, is to aspire to a religious office, not with a view to increase of grace, but to add to our worldly means.