Romans 11:8
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."
Matthew 13:13-14
Therefore, I am speaking to them with parables because [although] they can see, they [really] do not perceive, and [although] they can hear, they [really] do not comprehend, and so they [utterly] fail to understand [what I am trying to get across].
Mark 4:11-12
He said to them, "You disciples are being given an understanding of the secret of the kingdom of God, but to outsiders everything will be told in parables.
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.
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].
2 Corinthians 3:14-15
But the minds of the Israelites became dull for, to this very day, the same veil remains on them [i.e., figuratively] when the Old Agreement [Scriptures] are read. It is not being revealed to them that the Old Agreement is being abolished by Christ [i.e., by His death on the cross. See Col. 2:14].