John Chrysostom
Catena Aurea · Johannesevangelium 6
Verily, verily, I say unto you, He that believeth on me hath everlasting life. I am that bread of life. Your fathers did eat manna in the wilderness, and are dead. This is the bread which cometh down from heaven, that a man may eat thereof, and not die. I am the living bread which came down from heaven: if any man eat of this bread, he shall live for ever.
(Hom. xlvi. 2) He then gives them a strong reason for believing that they were given for higher privileges than their fathers. Their fathers eat manna and were dead; whereas of this bread He says, that a man may eat thereof, and not die. The difference of the two is evident from the difference of their ends. By bread here is meant wholesome doctrine, and faith in Him, or His body: for these are the preservatives of the soul.