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28. Then they said to him, “What must we do, to be doing the works of God?”
29. Jesus answered them, “This is the work of God, that you believe in him whom he has sent.”
44. No one can come to me unless the Father who sent me draws him, and I will raise him up at the last day.
45. 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—
60. When many of his disciples heard it, they said, “This is a hard saying; who can listen to it?”
61. But Jesus, knowing in himself that his disciples were grumbling about this, said to them, “Do you take offense at this?
62. Then what if you were to see the Son of Man ascending to where he was before?
63. It is the Spirit who gives life; the flesh is of no avail. The words that I have spoken to you are spirit and life.
64. 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.)
65. And he said, “This is why I told you that no one can come to me unless it is granted him by the Father.”
66. After this many of his disciples turned back and no longer walked with him.
67. So Jesus said to the Twelve, “Do you want to go away as well?”
68. Simon Peter answered him, “Lord, to whom shall we go? You have the words of eternal life,
69. and we have believed, and have come to know, that you are the Holy One of God.”

taken from a number of translations including the NET Bible