Jesus’ teachings in John 6 got too hard. Seriously, look it up. After the miraculous feeding of the 5,000, people were coming at Him to make Him their King, and He then taught them, saying “Eat my flesh, and drink my blood, so you can live forever.” Out of the hundreds present, only the 12 remained with Jesus, because for the rest, the teaching was too hard. Again, there was an argument that arose among the 12 over who would be the greatest, John and James’ mother requested Jesus place her sons on His left and right hands (positions of authority) when He came in to the Kingdom. He asked them “Are you willing to drink the cup I am to drink?” (He was speaking of His suffering and death).
We are so far removed from the sacrifices, most of us don’t really understand this significance. To eat of a Sacrifice meant to accept the atonement of and the worship of the God that the Sacrifice was made to. The Cup, representing a drink offering, usually poured out before a God, and/or shared among those worshipping (Jesus mentions this in Luke at the Last supper), meant to accept the rules and law in worship of that God. Jesus is telling His followers that we must accept His rule and Law as both God and King. He is telling us that His bread and His wine (body and blood) are what sustains and nourishes us. They follow Jesus, even if it means death; they drink the cup He drank, sharing in His death and suffering. (An example from Scripture: James would die by the sword, while John, the only one to die a natural death, would be arrested numerous times, they tried to kill him, and he would die in imprisonment.)
Fair Weather followers of Jesus, those who are there when it is easy, but leave when it gets tough, don’t really Follow Jesus; they follow their idea of Jesus, hoping to gain peace prosperity, a king for their physical needs without changing Spiritually. In order to follow Jesus, we must “Eat” His flesh and “Drink” His blood, living as He calls us, worshipping Him only, and advancing His Kingdom. There is no other way.
On the next day the crowd that remained on the other side of the sea saw that there had been only one boat there, and that Jesus had not entered the boat with his disciples, but that his disciples had gone away alone. Other boats from Tiberias came near the place where they had eaten the bread after the Lord had given thanks. So when the crowd saw that Jesus was not there, nor his disciples, they themselves got into the boats and went to Capernaum, seeking Jesus.
When they found him on the other side of the sea, they said to him, “Rabbi, when did you come here?” Jesus answered them, “Truly, truly, I say to you, you are seeking me, not because you saw signs, but because you ate your fill of the loaves. Do not work for the food that perishes, but for the food that endures to eternal life, which the Son of Man will give to you. For on him God the Father has set his seal.” Then they said to him, “What must we do, to be doing the works of God?” Jesus answered them, “This is the work of God, that you believe in him whom he has sent.” So they said to him, “Then what sign do you do, that we may see and believe you? What work do you perform? Our fathers ate the manna in the wilderness; as it is written, ‘He gave them bread from heaven to eat.’” Jesus then said to them, “Truly, truly, I say to you, it was not Moses who gave you the bread from heaven, but my Father gives you the true bread from heaven. For the bread of God is he who comes down from heaven and gives life to the world.” They said to him, “Sir, give us this bread always.”
Jesus said to them, “I am the bread of life; whoever comes to me shall not hunger, and whoever believes in me shall never thirst. But I said to you that you have seen me and yet do not believe. All that the Father gives me will come to me, and whoever comes to me I will never cast out. For I have come down from heaven, not to do my own will but the will of him who sent me. And this is the will of him who sent me, that I should lose nothing of all that he has given me, but raise it up on the last day. For this is the will of my Father, that everyone who looks on the Son and believes in him should have eternal life, and I will raise him up on the last day.”
So the Jews grumbled about him, because he said, “I am the bread that came down from heaven.” They said, “Is not this Jesus, the son of Joseph, whose father and mother we know? How does he now say, ‘I have come down from heaven’?” Jesus answered them, “Do not grumble among yourselves. No one can come to me unless the Father who sent me draws him. And I will raise him up on the last day. It is written in the Prophets, ‘And they will all be taught by God.’ Everyone who has heard and learned from the Father comes to me—not that anyone has seen the Father except he who is from God; he has seen the Father. Truly, truly, I say to you, whoever believes has eternal life. I am the bread of life. Your fathers ate the manna in the wilderness, and they died. This is the bread that comes down from heaven, so that one may eat of it and not die. I am the living bread that came down from heaven. If anyone eats of this bread, he will live forever. And the bread that I will give for the life of the world is my flesh.”
The Jews then disputed among themselves, saying, “How can this man give us his flesh to eat?” So Jesus said to them, “Truly, truly, I say to you, unless you eat the flesh of the Son of Man and drink his blood, you have no life in you. Whoever feeds on my flesh and drinks my blood has eternal life, and I will raise him up on the last day. For my flesh is true food, and my blood is true drink. Whoever feeds on my flesh and drinks my blood abides in me, and I in him. As the living Father sent me, and I live because of the Father, so whoever feeds on me, he also will live because of me. This is the bread that came down from heaven, not like the bread the fathers ate, and died. Whoever feeds on this bread will live forever.” Jesus said these things in the synagogue, as he taught at Capernaum.
When many of his disciples heard it, they said, “This is a hard saying; who can listen to it?” But Jesus, knowing in himself that his disciples were grumbling about this, said to them, “Do you take offense at this? Then what if you were to see the Son of Man ascending to where he was before? It is the Spirit who gives life; the flesh is no help at all. The words that I have spoken to you are spirit and life. But there are some of you who do not believe.” (For Jesus knew from the beginning who those were who did not believe, and who it was who would betray him.) And he said, “This is why I told you that no one can come to me unless it is granted him by the Father.”
After this many of his disciples turned back and no longer walked with him. So Jesus said to the twelve, “Do you want to go away as well?” Simon Peter answered him, “Lord, to whom shall we go? You have the words of eternal life, and we have believed, and have come to know, that you are the Holy One of God.” Jesus answered them, “Did I not choose you, the twelve? And yet one of you is a devil.” He spoke of Judas the son of Simon Iscariot, for he, one of the twelve, was going to betray him.