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There you Catholics go again with the carnality over the repeated message that it is faithing in/believing in Jesus as the One Sent by God for our salvation, too feed your egos for the loyalty of doing doing doing to strive for eternal life instead of just accepting The Holy Spirit seal and THEN working IN your salvation:

Time for Bible study regarding John 6:
Read carefully what follows for there is a sequence of exchanges which reveal the hearts of the listeners who continued to demand of JESUS what THEY could do to earn something God was offering at no charge to them only to Him.

John 6:
24 When the crowd saw that neither Jesus nor his disciples were there, they got into these boats and went to Capernaum to look for Jesus. When they had found him on the other side of the sea, they asked him, “Rabbi, when did you get here?”
26Jesus replied to them, “Truly, I tell all of you emphatically, you are looking for me, not because you saw signs, but because you ate the loaves and were completely satisfied. Do not work for food that perishes but for food that lasts for eternal life, which the Son of Man will give you, because God the Father has set his seal on him.” [Notice here that Jesus is establishing the contrast between carnal bread for the stomach and spiritual bread for the soul and spirit. If you miss this entry He gave you will be tempted to focus upon just a carnal meaning.]
Then they asked him, “What must we do to perform God’s works?”

These were Jews steeped in doing the works of the law, and failing. To these Jesus came, to offer the Grace of God shown as Promise to forgive their sin for thousands of years through the sacrifice of animals, using the blood to atone. These were people who believed they could earn eternal life by doing, and Jesus was about to reveal the truth regarding their sacrifices and offerings, that these were pointing toward the Grace of God offered to them for one and only one act they could do.

John 6:29 Jesus answered them, “This is God’s work: to believe in the one whom he has sent.”
30So they asked him, “What sign are you going to do so that we may see it and believe in you? What actions are you performing? Our ancestors ate the manna in the wilderness, just as it is written, ‘He gave them bread from heaven to eat.’” [Ask yourself, were the Jews in the desert given eternal life by eating the manna? No, the entire denying generation except for Kaleb and Joshua died out there in the desert over a forty year period. God gave them the bread despite their refusal to accept HIS Promise of the Land they were to inhabit. They refused to accept GOD's Grace so they wandered for forty years in the desert being fed manna from God only to die out there.]
32 Jesus told them, “Truly, I tell all of you emphatically, it was not Moses who gave you the bread from heaven, but it is my Father who gives you the true bread from heaven. The bread of God is the one who comes down from heaven and gives life to the world.”

At this point the commands from GOD to not eat the blood were clear in the minds of these seekers after signs, this throng demanding to know what they could do -like trying to keep the Ten Commandments and the lengthy list of the Laws of Moses- and they were stuck in that rut of them working for eternal life! Pride of their works was in the hearts and they were demanding more signs and more of what they could do to earn ...
These seekers after signs and wonders had God as Jesus right there with them and refused to receive the lesson Jesus just gave them regarding eternal life ONLY by faithing in Him. They were stuck on the carnal so Jesus gave them a shock lesson, which I believe eventually caused some of them to give up and just Trust Messiah, but probably not a majority of them.
Because they knew the commands of God to not eat the blood, JESUS used that to confound their demands:

John 6:35 Jesus told them, “I am the bread of life. Whoever comes to me will never become hungry, and whoever believes in me will never become thirsty. I told you that you have seen me, yet you don’t believe. Everything the Father gives me will come to me, and I’ll never turn away the one who comes to me. I have come down from heaven, not to do my own will, but the will of the one who sent me. And this is the will of the one who sent me, that I should not lose anything that he has given me, but should raise it to life on the last day. This is my Father’s will: That everyone who sees the Son and believes in him should have eternal life, and I will raise him to life on the last day.”[There it is again, belief brings the spiritual gift, not the carnal eating. Jesu just repeated what He told them at the beginning of this series of exchanges, that faith in / belief in Whom God has sent is the means by which the Grace of God is active in the believers. That glorifies JESUS, never the doers and seekers of signs and wonders.
41 Then the Jewish leaders began grumbling about him because he said, “I am the bread that came down from heaven.”They kept saying, “This is Jesus, the son of Joseph, isn’t it, whose father and mother we know? So how can he say, ‘I have come down from heaven’?”

But they continued in their unbelief, so Jesus made it even plainer:

John 6:43 Jesus answered them, “Stop grumbling among yourselves. No one can come to me unless the Father who sent me draws him, and I will raise him to life on the last day. It is written in the Prophets, ‘And all of them will be taught by God.’ Everyone who has listened to the Father and has learned anything comes to me. Not that anyone has seen the Father except the one who comes from God. This one has seen the Father. Truly, I tell all of you emphatically, the one who believes in me has eternal life. I’m the bread of life. Your ancestors ate the manna in the wilderness and died. This is the bread that comes down from heaven, so that a person may eat it and not die. I’m the living bread that came down from heaven. If anyone eats this bread, he’ll live forever. And the bread I will give for the life of the world is my flesh.” [Note here that one does not receive a spiritual gift by physically eating it. JESUS emphasizes that BELIEVING / faithing is the way a spiritual gift is received! The manna did not impart spiritual life to the Jews in the desert. That is Jesus teaching them in John 6.]
52 Then the Jewish leaders debated angrily with each other, asking, “How can this man give us his flesh to eat?” [These were stuck on the carnal and unable to see the spiritual! The Catholic command to eat the real flesh is a living example of the same stuck on the carnal which Jesus gave them over to in their unbelief!]
BECAUSE they continued to murmur in UNBELIEF refusing to FAITHE in / trust in / believe in HIM WHOM GOD SENT FOR THEIR DELIVERER, Jesus confounded their unbelief by speaking of a spiritual mystery HE KNEW they would take literally as a physical thing, in their refusal of HIM because they wanted to earn what can only be received by GRACE. JESUS gave them over to their carnal:

John 6:53 So Jesus told them, “Truly, I tell all of you emphatically, unless you eat the flesh of the Son of Man and drink his blood, you don’t have life in yourselves. Whoever eats my flesh and drinks my blood has eternal life, and I’ll raise him to life on the last day, 55because my flesh is real food, and my blood is real drink. The person who eats my flesh and drinks my blood remains in me, and Iin him. Just as the living Father sent me and I live because of the Father, so the one who feeds on me will also live because of me. [Ask yourself, did Jesus eat the flesh of the Father? NO! The sustenance was SPIRITUAL from The Father to Jesus! Jesus faithed in the Father. The bread from the Father was the will of the Father for what HE would do through / by Jesus. The words of the Father, the works of The Father were the meat to Jesus. In a moment Jesus would confirm this to those who stayed with Him who were not stuck in the carnal, stuck at carnal like catholiciism because they wanted to have their works approved. They could not disobey the commands against eating the blood, so they turned away because they wanted their carnal pride to count in God's calculus!] 58This is the bread that came down from heaven, not the kind that your ancestors ate. [It cannot be any plainer than that; Jesus tells them this bread from Heaven is not like the kind you eat into your bellies![ They died, but the one who eats this bread will live forever.” He said this while teaching in the synagogue at Capernaum.

The 'eating this bread' refers to a spiritual consuming, as in the remembrance carried out by breaking bread and sipping the wine showing belief in Him Whom GOD sent for eternal life. The eating is a physical act using common substances BUT showing a spiritual belief connection to JESUS.
The noting of where these teachings happened is significant. Capernaum had cliffs with many burial holes in them, where paganized believers brought foods to the dead. It was a place of great superstition and mythical beliefs connected to physical acts enjoining the pagans to mysteries. Jesus just sorted sheep and goats: the sheep remained and the goats departed ...

John 6:60 When many of his disciples heard this, they said, “This is a difficult statement. Who can accept it?”
61 But Jesus, knowing within himself that his disciples were grumbling about this, asked them, “Does this offend you? 62What if you saw the Son of Man going up to the place where he was before? It’s the Spirit who gives life; the flesh accomplishes nothing. The words that I’ve spoken to you are spirit and life. 64But there are some among you who don’t believe {Judas remained with the disciples yet he was not a believer, but most of the followers left because they too were stuck in the carnal mind. Judas believed, he believed Jesus would establish the physical kingdom, but Jesus was teaching all of them spiritual matters, Truths no carnal mind understands even today right here on this thread!)