Proverbs 1:22
“How long, O simple ones, will you love your simple ways? How long will scoffers delight in their scorn and fools hate knowledge?

Isaiah 44:18
They do not comprehend or discern, for He has shut their eyes so they cannot see and closed their minds so they cannot understand.

Jeremiah 4:22
“For My people are fools; they have not known Me. They are foolish children, without understanding. They are skilled in doing evil, but they know not how to do good.”

Romans 1:21-22
For although they knew God, they neither glorified Him as God nor gave thanks to Him, but they became futile in their thinking and darkened in their foolish hearts. / Although they claimed to be wise, they became fools,

Matthew 13:13-15
This is why I speak to them in parables: ‘Though seeing, they do not see; though hearing, they do not hear or understand.’ / In them the prophecy of Isaiah is fulfilled: ‘You will be ever hearing but never understanding; you will be ever seeing but never perceiving. / For this people’s heart has grown callous; they hardly hear with their ears, and they have closed their eyes. Otherwise they might see with their eyes, hear with their ears, understand with their hearts, and turn, and I would heal them.’

Isaiah 6:9-10
And He replied: “Go and tell this people, ‘Be ever hearing, but never understanding; be ever seeing, but never perceiving.’ / Make the hearts of this people calloused; deafen their ears and close their eyes. Otherwise they might see with their eyes, hear with their ears, understand with their hearts, and turn and be healed.”

Ezekiel 12:2
“Son of man, you are living in a rebellious house. They have eyes to see but do not see, and ears to hear but do not hear, for they are a rebellious house.

Mark 8:17-18
Aware of their conversation, Jesus asked them, “Why are you debating about having no bread? Do you still not see or understand? Do you have such hard hearts? / ‘Having eyes, do you not see? And having ears, do you not hear?’ And do you not remember?

1 Corinthians 2:14
The natural man does not accept the things that come from the Spirit of God. For they are foolishness to him, and he cannot understand them, because they are spiritually discerned.

Ephesians 4:18
They are darkened in their understanding and alienated from the life of God because of the ignorance that is in them due to the hardness of their hearts.

Hosea 4:6
My people are destroyed for lack of knowledge. Because you have rejected knowledge, I will also reject you as My priests. Since you have forgotten the law of your God, I will also forget your children.

2 Timothy 3:7
who are always learning but never able to come to a knowledge of the truth.

Deuteronomy 32:28-29
Israel is a nation devoid of counsel, with no understanding among them. / If only they were wise, they would understand it; they would comprehend their fate.

John 12:40
“He has blinded their eyes and hardened their hearts, so that they cannot see with their eyes, and understand with their hearts, and turn, and I would heal them.”

Acts 28:26-27
‘Go to this people and say, “You will be ever hearing but never understanding; you will be ever seeing but never perceiving.” / For this people’s heart has grown callous; they hardly hear with their ears, and they have closed their eyes. Otherwise they might see with their eyes, hear with their ears, understand with their hearts, and turn, and I would heal them.’