I offer as evidence the following passages of Scripture:
"31 Our fathers did eat manna in the desert, as it is written: He gave them bread from heaven to eat. 32 Then Jesus said to them: Amen, amen I say to you; Moses gave you not bread from heaven, but my Father giveth you the true bread from heaven. 33 For the bread of God is that which cometh down from heaven, and giveth life to the world. 34 They said therefore unto him: Lord, give us always this bread. 35 And Jesus said to them: I am the bread of life: he that cometh to me shall not hunger: and he that believeth in me shall never thirst.
36 But I said unto you, that you also have seen me, and you believe not. 37 All that the Father giveth to me shall come to me; and him that cometh to me, I will not cast out. 38 Because I came down from heaven, not to do my own will, but the will of him that sent me. 39 Now this is the will of the Father who sent me: that of all that he hath given me, I should lose nothing; but should raise it up again in the last day. 40 And this is the will of my Father that sent me: that every one who seeth the Son, and believeth in him, may have life everlasting, and I will raise him up in the last day.
41 The Jews therefore murmured at him, because he had said: I am the living bread which came down from heaven. 42 And they said: Is not this Jesus, the son of Joseph, whose father and mother we know? How then saith he, I came down from heaven? 43 Jesus therefore answered, and said to them: Murmur not among yourselves. 44 No man can come to me, except the Father, who hath sent me, draw him; and I will raise him up in the last day. 45 It is written in the prophets: And they shall all be taught of God. Every one that hath heard of the Father, and hath learned, cometh to me.
46 Not that any man hath seen the Father; but he who is of God, he hath seen the Father. 47 Amen, amen I say unto you: He that believeth in me, hath everlasting life. 48 I am the bread of life. 49 Your fathers did eat manna in the desert, and are dead. 50 This is the bread which cometh down from heaven; that if any man eat of it, he may not die.
51 I am the living bread which came down from heaven. 52 If any man eat of this bread, he shall live for ever; and the bread that I will give, is my flesh, for the life of the world. 53 The Jews therefore strove among themselves, saying: How can this man give us his flesh to eat? 54 Then Jesus said to them: Amen, amen I say unto you: Except you eat the flesh of the Son of man, and drink his blood, you shall not have life in you. 55 He that eateth my flesh, and drinketh my blood, hath everlasting life: and I will raise him up in the last day.
56 For my flesh is meat indeed: and my blood is drink indeed. 57 He that eateth my flesh, and drinketh my blood, abideth in me, and I in him. 58 As the living Father hath sent me, and I live by the Father; so he that eateth me, the same also shall live by me. 59 This is the bread that came down from heaven. Not as your fathers did eat manna, and are dead. He that eateth this bread, shall live for ever. 60 These things he said, teaching in the synagogue, in Capharnaum.
61 Many therefore of his disciples, hearing it, said: This saying is hard, and who can hear it? 62 But Jesus, knowing in himself, that his disciples murmured at this, said to them: Doth this scandalize you? 63 If then you shall see the Son of man ascend up where he was before? 64 It is the spirit that quickeneth: the flesh profiteth nothing. The words that I have spoken to you, are spirit and life. 65 But there are some of you that believe not. For Jesus knew from the beginning, who they were that did not believe, and who he was, that would betray him.
66 And he said: Therefore did I say to you, that no man can come to me, unless it be given him by my Father. 67 After this many of his disciples went back; and walked no more with him. 68 Then Jesus said to the twelve: Will you also go away? 69 And Simon Peter answered him: Lord, to whom shall we go? thou hast the words of eternal life. 70 And we have believed and have known, that thou art the Christ, the Son of God. "