Ephesians 4:18

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,

Ephesians 2:12

that at that time ye were without Christ, being aliens from the commonwealth of Israel and strangers from the covenants of promise, having no hope, and without God in the world,

Galatians 4:8

However then, when ye did not know God, ye did service unto those who by nature are not gods.

1 Thessalonians 4:5

not with affection of lust, as the Gentiles who do not know God,

Acts 17:30

For the times of this ignorance God overlooked, but he now commands all men everywhere to repent

Romans 1:21-23

because having known God, they did not glorify him as God, neither were thankful, but became vain in their imaginations, and their foolish heart was darkened.

Romans 11:25

For I would not, brethren, that ye ignore this mystery, that ye not be arrogant regarding yourselves: that blindness in part has happened in Israel, until the fullness of the Gentiles are come in.

Psalm 74:20

Have respect unto the covenant; for the dark places of the earth are full of the habitations of violence.

Psalm 115:4-8

Their idols are silver and gold, the work of men's hands.

Isaiah 44:18-20

They did not know nor understand; for he has anointed their eyes that they not see and their hearts that they not understand.

Isaiah 46:5-8

To whom will ye liken me and make me equal and compare me that we may be alike?

Daniel 5:20

But when his heart made itself arrogant, and his spirit hardened itself in pride, he was deposed from the throne of his kingdom, and they took his glory from him:

Matthew 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.

Mark 3:5

And looking round about on them with anger, being grieved for the blindness of their hearts, he said unto the man, Stretch forth thine hand. And he stretched it out and his hand was restored whole as the other.

John 12:40

He has blinded their eyes and hardened their heart, that they should not see with their eyes nor understand with their heart and be converted, and I should heal them.

Acts 26:17-18

delivering thee from the people and from the Gentiles, unto whom now I send thee

Romans 1:28

And even as they did not like to retain God in their knowledge, God gave them over to a perverse understanding, to do those things which are not convenient,

Romans 2:19

and art confident that thou thyself art a guide of the blind, a light of those who are in darkness,

Romans 8:7-8

because the prudence of the flesh is enmity against God; for it does not subject itself to the law of God, neither indeed can it.

1 Corinthians 1:21

For in the wisdom of God, since the world by wisdom knew not God, it pleased God by the foolishness of preaching to save those that believe.

2 Corinthians 3:14

(And thus their senses became hardened, for until this day remains the same veil not uncovered in the reading of the old testament, which veil is taken away in Christ.

2 Corinthians 4:4

In whom the god of this age has blinded the understanding of those who do not believe, that the light of the gospel of the glory of the Christ, who is the image of God, should not shine in them.

Colossians 1:21

And you, that were in another time alienated and enemies in your mind by wicked works, yet now he has reconciled you

James 4:4

Ye adulterers and adulteresses, know ye not that the friendship of the world is enmity with God? Whosoever therefore that desires to be a friend of the world, makes himself the enemy of God.

1 John 2:11

But he that hates his brother is in darkness and walks in darkness and does not know where he goes, because that darkness hath 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
Have respect unto the covenant; for the dark places of the earth are full of the habitations of violence.
Psalm 115:4
Their idols are silver and gold, the work of men's hands.
Isaiah 44:18
They did not know nor understand; for he has anointed their eyes that they not see and their hearts that they not understand.
Isaiah 46:5
To whom will ye liken me and make me equal and compare me that we may be alike?
Acts 17:30
For the times of this ignorance God overlooked, but he now commands all men everywhere to repent
Acts 26:17
delivering thee from the people and from the Gentiles, unto whom now I send thee
Romans 1:21
because having known God, they did not glorify him as God, neither were thankful, but became vain in their imaginations, and their foolish heart was darkened.
1 Corinthians 1:21
For in the wisdom of God, since the world by wisdom knew not God, it pleased God by the foolishness of preaching to save those that believe.
2 Corinthians 4:4
In whom the god of this age has blinded the understanding of those who do not believe, that the light of the gospel of the glory of the Christ, who is the image of God, should not shine in them.
Galatians 4:8
However then, when ye did not know God, ye did service unto those who by nature are not gods.
1 Thessalonians 4:5
not with affection of lust, as the Gentiles who do not know God,

Alienated

Ephesians 2:12
that at that time ye were without Christ, being aliens from the commonwealth of Israel and strangers from the covenants of promise, having no hope, and without God in the world,
Romans 8:7
because the prudence of the flesh is enmity against God; for it does not subject itself to the law of God, neither indeed can it.
Galatians 4:8
However then, when ye did not know God, ye did service unto those who by nature are not gods.
Colossians 1:21
And you, that were in another time alienated and enemies in your mind by wicked works, yet now he has reconciled you
1 Thessalonians 4:5
not with affection of lust, as the Gentiles who do not know God,
James 4:4
Ye adulterers and adulteresses, know ye not that the friendship of the world is enmity with God? Whosoever therefore that desires to be a friend of the world, makes himself the enemy of God.

Because

Romans 1:21
because having known God, they did not glorify him as God, neither were thankful, but became vain in their imaginations, and their foolish heart was darkened.
Romans 2:19
and art confident that thou thyself art a guide of the blind, a light of those who are in darkness,
1 John 2:11
But he that hates his brother is in darkness and walks in darkness and does not know where he goes, because that darkness hath blinded his eyes.

General references

Leviticus 11:16
the owl, the night hawk, the cuckow, and the hawk according to his species;
Deuteronomy 29:4
Yet the LORD has not given you a heart to perceive and eyes to see and ears to hear until today.