Heres a few more scriptures also on this, just coming in from a different way on it, but I find them helpful
Mat 13:10 And the disciples came, and said unto him, Why speakest thou unto them in parables?
Mat 13:11 He answered and said unto them, Because it is given unto you to know the mysteries of the kingdom of heaven, but to them it is not given.
Mat 13:12 For whosoever hath, to him shall be given, and he shall have more abundance: but whosoever hath not, from him shall be taken away even that he hath.
Mat 13:13 Therefore speak I to them in parables: because they seeing see not; and hearing they hear not, neither do they understand.
Mat 13:14 And in them is fulfilled the prophecy of Esaias, which saith, By hearing ye shall hear, and shall not understand; and seeing ye shall see, and shall not perceive:
Mat 13:15 For this people's heart is waxed gross, and their ears are dull of hearing, and their eyes they have closed; lest at any time they should see with their eyes, and hear with their ears, and should understand with their heart, and should be converted, and I should heal them.
Said here by Paul as well...
Acts 28:26 Saying, Go unto this people, and say, Hearing ye shall hear, and shall not understand; and seeing ye shall see, and not perceive:For 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.
In the context of Isaiah it also says...
Isaiah 6:11 Then said I, Lord, how long? And he answered, Until the cities be wasted without inhabitant, and the houses without man, and the land be utterly desolate,
Isaiah 6:12 And the LORD have removed men far away, and there be a great forsaking in the midst of the land.
Then back to the context Paul speaks of the words of Isaiah (as Jesus) of the same...
Acts 28:28 Be it known therefore unto you, that the salvation of God is sent unto the Gentiles, and that they will hear it.
Romans 10:19 But I say, Did not Israel know? First Moses saith, I will provoke you to jealousy by them that are no people, and by a foolish nation I will anger you.
Romans 10:20 But Esaias is very bold, and saith, I was found of them that sought me not; I was made manifest unto them that asked not after me.
Romans 10:21 But to Israel he saith, All day long I have stretched forth my hands unto a disobedient and gainsaying people.
Romans 11:7 What then? Israel hath not obtained that which he seeketh for; but the election hath obtained it, and the rest were blinded
Romans 11:8 (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.
Romans 11:15 For if the casting away of them be the reconciling of the world, what shall the receiving of them be,but life from the dead?
Romans 11:25 For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits;that blindness in part is happened to Israel, until the fulness of the Gentiles be come in.
And likewise it says...
Exodus 4:11 And the LORD said unto him, (Moses) Who hath made man's mouth? or who maketh the dumb, or deaf, or the seeing, or the blind? have not I the LORD?
Jesus would be the one of whom it is said, will raise up a prophet like unto thee
John 5:22 For the Father judgeth no man, but hath committed all judgment unto the Son
And Jesus said...
John 3:39 And Jesus said,
For judgment I am come into this world, that they which see not might see;and that they which see might be made blind.
Ezek 20:49 Then said I, Ah Lord GOD! they say of me, Doth he not speak parables?
Mat 13:13 Therefore speak I to them in parables: because they seeing see not; and hearing they hear not, neither do they understand.
And likewise says...
Romans 15:21 But as it is written, To whom he was not spoken of, they shall see: and that have not heard shall understand.
Acts 22:21 And he said unto me, Depart: for I will send thee far hence unto the Gentiles.
Romans 11:25 For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel, until the fulness of the Gentiles be come in.