John 6:61–65

61 Without being told, Jesus knew that they were grumbling about this, so he said to them, “Does this make you want to give up? 62Suppose, then, that you should see the Son of Man go back up to the place where he was before? 63What gives life is God’s Spirit; human power is of no use at all. The words I have spoken to you bring God’s life-giving Spirit. 64Yet some of you do not believe.” (Jesus knew from the very beginning who were the ones that would not believe and which one would betray him.) 65And he added, “This is the very reason I told you that no one can come to me unless the Father makes it possible for him to do so.”