Ephesians 4:18

being darkened in their understanding, excluded from the life of God because of the ignorance that is in them, because of the hardness of their heart;

Ephesians 2:12

remember that you were at that time separate from Christ, excluded from the commonwealth of Israel, and strangers to the covenants of promise, having no hope and without God in the world.

Galatians 4:8

However at that time, when you did not know God, you were slaves to those which by nature are no gods.

1 Thessalonians 4:5

not in lustful passion, like the Gentiles who do not know God;

Acts 17:30

Therefore having overlooked the times of ignorance, God is now declaring to men that all people everywhere should repent,

Romans 1:21-23

For even though they knew God, they did not honor Him as God or give thanks, but they became futile in their speculations, and their foolish heart was darkened.

Romans 11:25

For I do not want you, brethren, to be uninformed of this mystery—so that you will not be wise in your own estimation—that a partial hardening has happened to Israel until the fullness of the Gentiles has come in;

Psalm 74:20

Consider the covenant;
For the dark places of the land are full of the habitations of violence.

Psalm 115:4-8

Their idols are silver and gold,
The work of man’s hands.

Isaiah 44:18-20

They do not know, nor do they understand, for He has smeared over their eyes so that they cannot see and their hearts so that they cannot comprehend.

Isaiah 46:5-8

To whom would you liken Me
And make Me equal and compare Me,
That we would be alike?

Daniel 5:20

But when his heart was lifted up and his spirit became so proud that he behaved arrogantly, he was deposed from his royal throne and his glory was taken away from him.

Matthew 13:15

For the heart of this people has become dull,
With their ears they scarcely hear,
And they have closed their eyes,
Otherwise they would see with their eyes,
Hear with their ears,
And understand with their heart and return,
And I would heal them.’

Mark 3:5

After looking around at them with anger, grieved at their hardness of heart, He *said to the man, “Stretch out your hand.” And he stretched it out, and his hand was restored.

John 12:40

He has blinded their eyes and He hardened their heart, so that they would not see with their eyes and perceive with their heart, and be converted and I heal them.”

Acts 26:17-18

rescuing you from the Jewish people and from the Gentiles, to whom I am sending you,

Romans 1:28

And just as they did not see fit to acknowledge God any longer, God gave them over to a depraved mind, to do those things which are not proper,

Romans 2:19

and are confident that you yourself are a guide to the blind, a light to those who are in darkness,

Romans 8:7-8

because the mind set on the flesh is hostile toward God; for it does not subject itself to the law of God, for it is not even able to do so,

1 Corinthians 1:21

For since in the wisdom of God the world through its wisdom did not come to know God, God was well-pleased through the foolishness of the message preached to save those who believe.

2 Corinthians 3:14

But their minds were hardened; for until this very day at the reading of the old covenant the same veil remains unlifted, because it is removed in Christ.

2 Corinthians 4:4

in whose case the god of this world has blinded the minds of the unbelieving so that they might not see the light of the gospel of the glory of Christ, who is the image of God.

Colossians 1:21

And although you were formerly alienated and hostile in mind, engaged in evil deeds,

James 4:4

You adulteresses, do you not know that friendship with the world is hostility toward God? Therefore whoever wishes to be a friend of the world makes himself an enemy of God.

1 John 2:11

But the one who hates his brother is in the darkness and walks in the darkness, and does not know where he is going because the darkness has blinded his eyes.

Treasury of Scripture Knowledge

Summary

Having the understanding darkened, being alienated from the life of God through the ignorance that is in them, because of the blindness of their heart:

General references

Bible References

The understanding

Psalm 74:20
Consider the covenant;
For the dark places of the land are full of the habitations of violence.
Psalm 115:4
Their idols are silver and gold,
The work of man’s hands.
Isaiah 44:18
They do not know, nor do they understand, for He has smeared over their eyes so that they cannot see and their hearts so that they cannot comprehend.
Isaiah 46:5
To whom would you liken Me
And make Me equal and compare Me,
That we would be alike?
Acts 17:30
Therefore having overlooked the times of ignorance, God is now declaring to men that all people everywhere should repent,
Acts 26:17
rescuing you from the Jewish people and from the Gentiles, to whom I am sending you,
Romans 1:21
For even though they knew God, they did not honor Him as God or give thanks, but they became futile in their speculations, and their foolish heart was darkened.
1 Corinthians 1:21
For since in the wisdom of God the world through its wisdom did not come to know God, God was well-pleased through the foolishness of the message preached to save those who believe.
2 Corinthians 4:4
in whose case the god of this world has blinded the minds of the unbelieving so that they might not see the light of the gospel of the glory of Christ, who is the image of God.
Galatians 4:8
However at that time, when you did not know God, you were slaves to those which by nature are no gods.
1 Thessalonians 4:5
not in lustful passion, like the Gentiles who do not know God;

Alienated

Ephesians 2:12
remember that you were at that time separate from Christ, excluded from the commonwealth of Israel, and strangers to the covenants of promise, having no hope and without God in the world.
Romans 8:7
because the mind set on the flesh is hostile toward God; for it does not subject itself to the law of God, for it is not even able to do so,
Galatians 4:8
However at that time, when you did not know God, you were slaves to those which by nature are no gods.
Colossians 1:21
And although you were formerly alienated and hostile in mind, engaged in evil deeds,
1 Thessalonians 4:5
not in lustful passion, like the Gentiles who do not know God;
James 4:4
You adulteresses, do you not know that friendship with the world is hostility toward God? Therefore whoever wishes to be a friend of the world makes himself an enemy of God.

Because

Romans 1:21
For even though they knew God, they did not honor Him as God or give thanks, but they became futile in their speculations, and their foolish heart was darkened.
Romans 2:19
and are confident that you yourself are a guide to the blind, a light to those who are in darkness,
1 John 2:11
But the one who hates his brother is in the darkness and walks in the darkness, and does not know where he is going because the darkness has blinded his eyes.

General references

Leviticus 11:16
and the ostrich and the owl and the sea gull and the hawk in its kind,
Deuteronomy 29:4
Yet to this day the Lord has not given you a heart to know, nor eyes to see, nor ears to hear.