John Chrysostom
Catena Aurea · Johannesevangelium 6
Many therefore of his disciples, when they had heard this, said, This is an hard saying; who can hear it? When Jesus knew in himself that his disciples murmured at it, he said unto them, Doth this offend you? What and if ye shall see the Son of man ascend up where he was before? It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life. But there are some of you that believe not. For Jesus knew from the beginning who they were that believed not, and who should betray him. And he said, Therefore said I unto you, that no man can come unto me, except it were given unto him of my Father. From that time many of his disciples went back, and walked no more with him. Then said Jesus unto the twelve, Will ye also go away? Then Simon Peter answered him, Lord, to whom shall we go? thou hast the words of eternal life. And we believe and are sure that thou art that Christ, the Son of the living God. Jesus answered them, Have not I chosen you twelve, and one of you is a devil? He spake of Judas Iscariot the son of Simon: for he it was that should betray him, being one of the twelve. And from that time many of the disciples went back, and walked no more with Him.
(Hom. xlvi. 2) But it may be asked, what reason was there for speaking words to them which did not edify, but might rather have injured them? It was very useful and necessary; for this reason, they had been just now urgent in petitioning for bodily food, and reminding Him of that which had been given to their fathers. So He reminds them here of spiritual food; to shew that all those miracles were typical. They ought not then to have been offended, but should have enquired of Him further. The scandal was owing to their fatuity, not to the difficulty of the truths declared by our Lord.