Acts 28:26
saying, [Isa. 6:9-10], 'Go to these people and say, you will hear all right, but you will not understand [what you hear]. You will see all right, but you will not perceive [what you see].
Matthew 13:14-15
So, the prophecy of Isaiah is being fulfilled by them, which says, [Isa. 6:9f] 'You will hear all right, but you will not understand [what you hear]. You will see all right but you will not perceive [what you see].
Mark 4:12
This is so that even though they see, they will see and yet not perceive. And even though they hear, they will hear and yet not understand. For if they did, they would turn [back to God] again and receive forgiveness."
Luke 8:10
And He said to them, "You [disciples] are being given an understanding of the secrets of the kingdom of God, but the rest of the people [are being told] in parables, so that [even though they appear to be] seeing, they will not [actually] see; and [even though they seem to] hear, they will not understand.
Mark 8:17-18
Jesus, being aware of what they were thinking, said, "Why are you reasoning about not having any bread? Have you not yet perceived or understood? Have your hearts become insensitive?
Luke 24:25
Then Jesus said to them, "You foolish men! How slow your minds are to believe everything the prophets have spoken [in their writings]!
Luke 24:45
Then He opened their minds [miraculously ?] so they would understand the Scriptures.
John 12:38-40
This was so that these words, which Isaiah the prophet had spoken, would be fulfilled [Isa. 53:1], "Lord, who has believed our message? And who has the Lord's power been shown to?"
Romans 11:8-10
as it has been written [Isa. 19:10], "God gave them a spirit of numbness [i.e., they developed a spiritual insensitivity to God and His word]. [He gave them] eyes to see with [but they would not look], and ears to hear with [but they did not listen]. And they still have this spirit."
2 Corinthians 4:4-6
For the god of this world [i.e., Satan] has blinded the minds of the unbelievers, so that they would not see the light of the Gospel of the splendor of Christ, who is the image of God.