Good morning Thomas, I hope all is well.
Fine, thanks, I hope you are, too.
I see John 6:63 is worth considering ...
When citing individual verses of a text, we must always look to the surrounding context.
In the case of John 6, we have the Feeding of the Five Thousand, and the discourse on the Bread of Life, and then the further teaching at the synagogue in Capernaum.
Verse 51 seems to mark the break between the discourse to the multitude, and a deeper understanding given to the disciples with him in the synagogue (cf v60).
So the discourse begins again where it left off: "I am the living bread which came down from heaven" (v51).
Here begins a deeper teaching on the Eucharist, which even the disciples found hard to take: "Many therefore of his disciples, hearing it, said: This saying is hard, and who can hear it?" (v61)
"Does this scandalize you?" He asks them. "If then you shall see the Son of man
ascend up where he was before? It is the spirit (
pneuma) that quickeneth: the flesh (
sarx) profiteth nothing. The words that I have spoken to you, are spirit (
pneuma) and life (
zoe)." (v62-64 emphasis mine).
So here we have Jesus speaking directly and explicitly of the Eucharist, of flesh and blood, not simply as metaphor, but a (revealed) mystery. Jesus is declaring His divinity – not simply the Son by analogy, not an oracle or a prophet, but that He is the Logos of God and, as we have come to define it, the Hypostatic Union – the Union of the Divine and the human – a union of which He, the Incarnate Son, is the Principle and Archetype actualised (living – physically present) in and to the world. It is the union of the spirit (pneuma) with the flesh (sarx) – the words He has spoken are spirit (
pneuma) and life (
zoe).
Life in this context to mean the whole person, body, soul and spirit, not a kind of dualism. The text in question then, "the flesh profiteth nothing" is understood in this context of His rebuke of their lack of faith in Him as the Incarnate Son. If He were merely a man, then then indeed 'the flesh profiteth nothing', but if, however, He is the Incarnate Son of God ...
This teaching, hard indeed, turns His audience against Him: "After these things Jesus walked in Galilee; for he would not walk in Judea, because the Jews sought to kill him" (John 7:1) because of the implication of His words.