This is beautiful... but explain how it makes a point for you
Jesus was answering the non-believing Jews who said scripture tells them Christ will live forever,(ignoring or ignorant of the prophecies concerning his death and how he would bear our transgressions, i.e. Isaiah 53) because Christ had just told them how he would die. Here is a fuller account: (John 12)
27Now is
my soul troubled; and what shall I say?
Father, save me from this hour: but for this cause came I unto this hour.
28Father, glorify thy name. Then came there a voice from heaven, saying, I have both glorified it, and will glorify it again.
29The people therefore, that stood by, and heard it, said that it thundered: others said, An angel spake to him.
30Jesus answered and said, This voice came not because of me, but for your sakes.
31Now is the judgment of this world: now shall the prince of this world be cast out.
32And I, if I be lifted up from the earth, will draw all men unto me.
33This he said, signifying what death he should die.
34The people answered him, We have heard out of the law that Christ abideth for ever: and how sayest thou, The Son of man must be lifted up? who is this Son of man?
35Then Jesus said unto them,
Yet a little while is the light with you. Walk while ye have the light, lest darkness come upon you: for he that walketh in darkness knoweth not whither he goeth.
36While ye have light, believe in the light, that ye may be the children of light. These things spake Jesus, and departed, and did hide himself from them.
37But though he had done so many miracles before them, yet they believed not on him:
38That the saying of Esaias the prophet might be fulfilled, which he spake, Lord, who hath believed our report? and to whom hath the arm of the Lord been revealed?
39Therefore they could not believe, because that Esaias said again,
40He hath blinded their eyes, and hardened their heart; that they should not see with their eyes, nor understand with their heart, and be converted, and I should heal them.
41These things said Esaias, when he saw his glory, and spake of him. 42Nevertheless among the chief rulers also many believed on him; but because of the Pharisees they did not confess him, lest they should be put out of the synagogue:
Here are some more passages:
Acts 28
23And when they had appointed him a day, there came many to him into his lodging; to whom
he expounded and testified the kingdom of God, persuading them concerning Jesus, both out of the law of Moses, and out of the prophets, from morning till evening.
24And some believed the things which were spoken, and some believed not.
25And when they agreed not among themselves, they departed, after that Paul had spoken one word,
Well spake the Holy Ghost by Esaias the prophet unto our fathers,
26Saying, Go unto this people, and say, Hearing ye shall hear, and shall not understand; and seeing ye shall see, and not perceive:
27For the heart of this people is waxed gross, and their ears are dull of hearing, and their eyes have they closed; lest they should see with their eyes, and hear with their ears, and understand with their heart, and should be converted, and I should heal them.
28Be it known therefore unto you, that the salvation of God is sent unto the Gentiles, and that they will hear it. 29And when he had said these words, the Jews departed, and had great reasoning among themselves.
Stephen said: (Acts 7)
51
Ye stiffnecked and uncircumcised in heart and ears, ye do always resist the Holy Ghost: as your fathers did, so do ye. 52Which of the prophets have not your fathers persecuted? and they have slain them which shewed before of the coming of the Just One; of whom ye have been now the betrayers and murderers:
And Paul when warning those who would oppose the Jewish People: (Romans 11)
5Even so then at this present time also
there is a remnant (of Jews) according to the election of grace.
6And if by grace, then is it no more of works: otherwise grace is no more grace. But if it be of works, then it is no more grace: otherwise work is no more work.
7
What then? Israel hath not obtained that which he seeketh for; but the election hath obtained it, and the rest were blinded.
8(According as it is written, God hath given them the spirit of slumber, eyes that they should not see, and ears that they should not hear
unto this day.
9And David saith, Let their table be made a snare, and a trap, and a stumblingblock, and a recompence unto them:
10Let their eyes be darkened, that they may not see, and bow down their back alway. 11I say then, Have they stumbled that they should fall? God forbid: but rather through their fall salvation is come unto the Gentiles, for to provoke them to jealousy. 
