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The key to understanding this passage is to look at the word believe.

It is defined as follows.

4100 pisteúō (from 4102 /pístis, "faith," derived from 3982 /peíthō, "persuade, be persuaded") – believe (affirm, have confidence); used of persuading oneself (= human believing) and with the sacred significance of being persuaded by the Lord (= faith-believing). Only the context indicates whether 4100 /pisteúō ("believe") is self-serving (without sacred meaning), or the believing that leads to/proceeds from God's inbirthing of faith.

John makes extensive use of this word in his Gospel. IIRC it is used 81 times by John in various forms with 80 of these being in reference to believing in Christ.

26Jesus answered them and said, “Truly, truly, I say to you, you seek Me, not because you saw signs, but because you ate of the loaves and were filled. 27“Do not work for the food which perishes, but for the food which endures to eternal life, which the Son of Man will give to you, for on Him the Father, God, has set His seal.” 28Therefore they said to Him, “What shall we do, so that we may work the works of God?” 29Jesus answered and said to them, “This is the work of God, that you believe in Him whom He has sent.” 30So they said to Him, “What then do You do for a sign, so that we may see, and believe You? What work do You perform? 31“Our fathers ate the manna in the wilderness; as it is written, ‘HE GAVE THEM BREAD OUT OF HEAVEN TO EAT.’” 32Jesus then said to them, “Truly, truly, I say to you, it is not Moses who has given you the bread out of heaven, but it is My Father who gives you the true bread out of heaven. 33“For the bread of God is that which comes down out of heaven, and gives life to the world.” 34Then they said to Him, “Lord, always give us this bread.”

35Jesus said to them, “I am the bread of life; he who comes to Me will not hunger, and he who believes in Me will never thirst. 36“But I said to you that you have seen Me, and yet do not believe.

37“All that the Father gives Me will come to Me, and the one who comes to Me I will certainly not cast out. (key passage on our eternal security)

38“For I have come down from heaven, not to do My own will, but the will of Him who sent Me. 39“This is the will of Him who sent Me, that of all that He has given Me I lose nothing, but raise it up on the last day. (second reference to our eternal security)

40“For this is the will of My Father, that everyone who beholds the Son and believes in Him will have eternal life, and I Myself will raise him up on the last day.”

41Therefore the Jews were grumbling about Him, because He said, “I am the bread that came down out of heaven.” 42They were saying, “Is not this Jesus, the son of Joseph, whose father and mother we know? How does He now say, ‘I have come down out of heaven’?” 43Jesus answered and said to them, “Do not grumble among yourselves. 44“No one can come to Me unless the Father who sent Me draws him; and I will raise him up on the last day. 45“It is written in the prophets, ‘AND THEY SHALL ALL BE TAUGHT OF GOD.’ Everyone who has heard and learned from the Father, comes to Me. 46“Not that anyone has seen the Father, except the One who is from God; He has seen the Father.

47“Truly, truly, I say to you, he who believes has eternal life.

48“I am the bread of life. 49“Your fathers ate the manna in the wilderness, and they died. 50“This is the bread which comes down out of heaven, so that one may eat of it and not die. 51“I am the living bread that came down out of heaven; if anyone eats of this bread, he will live forever; and the bread also which I will give for the life of the world is My flesh.”

52Then the Jews began to argue with one another, saying, “How can this man give us His flesh to eat?” 53So 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 yourselves. 54“He who eats My flesh and drinks My blood has eternal life, and I will raise him up on the last day. 55“For My flesh is true food, and My blood is true drink. 56“He who eats My flesh and drinks My blood abides in Me, and I in him. 57“As the living Father sent Me, and I live because of the Father, so he who eats Me, he also will live because of Me. 58“This is the bread which came down out of heaven; not as the fathers ate and died; he who eats this bread will live forever.”

(We do this through believing in Him...but the Jews and some of His disciples don't understand what He's saying here.)

59These things He said in the synagogue as He taught in Capernaum.

60Therefore many of His disciples, when they heard this said, “This is a difficult statement; who can listen to it?”

61But Jesus, conscious that His disciples grumbled at this, said to them, “Does this cause you to stumble? 62“What then if you see the Son of Man ascending to where He was before?

63“It is the Spirit who gives life; the flesh profits nothing; the words that I have spoken to you are spirit and are life.

64“But there are some of you who do not believe.” For Jesus knew from the beginning who they were who did not believe, and who it was that would betray Him. 65And He was saying, “For this reason I have said to you, that no one can come to Me unless it has been granted him from the Father.”

66As a result of this many of His disciples withdrew and were not walking with Him anymore. (they left because of what He said in the immediate verses. they did not believe in Him)

67So Jesus said to the twelve, “You do not want to go away also, do you?”

68Simon Peter answered Him, “Lord, to whom shall we go? You have words of eternal life.

69“We have believed and have come to know that You are the Holy One of God.

” 70Jesus answered them, “Did I Myself not choose you, the twelve, and yet one of you is a devil?” 71Now He meant Judas the son of Simon Iscariot, for he, one of the twelve, was going to betray Him.

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Believing in Him, or faith in Him, is the clear consistent message of the NT as to how we have eternal life.