Theophylact of Ohrid
Catena Aurea · Johannesevangelium 6
Then said they unto him, What shall we do, that we might work the works of God? Jesus answered and said unto them, This is the work of God, that ye believe on him whom he hath sent. They said therefore unto him, What sign shewest thou then, that we may see, and believe thee? what dost thou work? Our fathers did eat manna in the desert; as it is written, He gave them bread from heaven to eat. Then said Jesus unto them, Verily, verily, I say unto you, Moses gave you not that bread from heaven; but my Father giveth you the true bread from heaven. For the bread of God is he which cometh down from heaven, and giveth life unto the world. Then said they unto him, Lord, evermore give us this bread.
He calls Himself the true bread, because the only-begotten Son of God, made man, was principally signified by the manna. For manna means literally, what is this? The Israelites were astonished at first on finding it, and asked one another what it was. And the Son of God, made man, is in an especial sense this mysterious manna, which we ask about, saying, What is this? How can the Son of God be the Son of man? How can one person consist of two natures?