Ephesians 4:18

being darkened in understanding, estranged from the life of God by reason of the ignorance which is in them, by reason of the hardness of their hearts,

Ephesians 2:12

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

Galatians 4:8

But then indeed, not knowing God, ye were in bondage to those who by nature are not gods;

1 Thessalonians 4:5

(not in passionate desire, even as the nations who know not God,)

Acts 17:30

God therefore, having overlooked the times of ignorance, now enjoins men that they shall all everywhere repent,

Romans 1:21-23

Because, knowing God, they glorified him not as God, neither were thankful; but fell into folly in their thoughts, and their heart without understanding was darkened:

Romans 11:25

For I do not wish you to be ignorant, brethren, of this mystery, that ye may not be wise in your own conceits, that blindness in part is happened to Israel, until the fulness of the nations be come in;

Psalm 74:20

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

Psalm 115:4-8

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

Isaiah 44:18-20

They have no knowledge, and understand not; for he hath plastered their eyes, that they may not see; and their hearts, that they may not understand.

Isaiah 46:5-8

To whom will ye liken me and make me equal, or compare me, that we may be like?

Daniel 5:20

But when his heart was lifted up, and his spirit hardened unto presumption, he was deposed from the throne of his kingdom, and they took his glory from him;

Matthew 13:15

for the heart of this people has grown fat, and they have heard heavily with their ears, and they have closed their eyes as asleep, lest they should see with the eyes, and hear with the ears, and understand with the heart, and should be converted, and I should heal them.

Mark 3:5

And looking round upon them with anger, distressed at the hardening of their heart, he says to the man, Stretch out thy hand. And he stretched it out, and his hand was restored.

John 12:40

He has blinded their eyes and hardened their heart, that they may not see with their eyes, and understand with their heart and be converted, and I should heal them.

Acts 26:17-18

taking thee out from among the people, and the nations, to whom I send thee,

Romans 1:28

And according as they did not think good to have God in their knowledge, God gave them up to a reprobate mind to practise unseemly things;

Romans 2:19

and hast confidence that thou thyself art a leader of the blind, a light of those who are in darkness,

Romans 8:7-8

Because the mind of the flesh is enmity against God: for it is not subject to the law of God; for neither indeed can it be:

1 Corinthians 1:21

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

2 Corinthians 3:14

But their thoughts have been darkened, for unto this day the same veil remains in reading the old covenant, unremoved, which in Christ is annulled.

2 Corinthians 4:4

in whom the god of this world has blinded the thoughts of the unbelieving, so that the radiancy of the glad tidings of the glory of the Christ, who is the image of God, should not shine forth for them.

Colossians 1:21

And you, who once were alienated and enemies in mind by wicked works, yet now has it reconciled

James 4:4

Adulteresses, know ye not that friendship with the world is enmity with God? Whoever therefore is minded to be the friend of the world is constituted enemy of God.

1 John 2:11

But he that hates his brother is in the darkness, and walks in the darkness, and knows not where he goes, 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
Have respect unto the covenant; for the dark places of the earth are full of the dwellings of violence.
Psalm 115:4
Their idols are silver and gold, the work of men's hands:
Isaiah 44:18
They have no knowledge, and understand not; for he hath plastered their eyes, that they may not see; and their hearts, that they may not understand.
Isaiah 46:5
To whom will ye liken me and make me equal, or compare me, that we may be like?
Acts 17:30
God therefore, having overlooked the times of ignorance, now enjoins men that they shall all everywhere repent,
Acts 26:17
taking thee out from among the people, and the nations, to whom I send thee,
Romans 1:21
Because, knowing God, they glorified him not as God, neither were thankful; but fell into folly in their thoughts, and their heart without understanding was darkened:
1 Corinthians 1:21
For since, in the wisdom of God, the world by wisdom has not known God, God has been pleased by the foolishness of the preaching to save those that believe.
2 Corinthians 4:4
in whom the god of this world has blinded the thoughts of the unbelieving, so that the radiancy of the glad tidings of the glory of the Christ, who is the image of God, should not shine forth for them.
Galatians 4:8
But then indeed, not knowing God, ye were in bondage to those who by nature are not gods;
1 Thessalonians 4:5
(not in passionate desire, even as the nations who know not God,)

Alienated

Ephesians 2:12
that ye were at that time without Christ, aliens 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 of the flesh is enmity against God: for it is not subject to the law of God; for neither indeed can it be:
Galatians 4:8
But then indeed, not knowing God, ye were in bondage to those who by nature are not gods;
Colossians 1:21
And you, who once were alienated and enemies in mind by wicked works, yet now has it reconciled
1 Thessalonians 4:5
(not in passionate desire, even as the nations who know not God,)
James 4:4
Adulteresses, know ye not that friendship with the world is enmity with God? Whoever therefore is minded to be the friend of the world is constituted enemy of God.

Because

Romans 1:21
Because, knowing God, they glorified him not as God, neither were thankful; but fell into folly in their thoughts, and their heart without understanding was darkened:
Romans 2:19
and hast confidence that thou thyself art a leader of the blind, a light of those who are in darkness,
1 John 2:11
But he that hates his brother is in the darkness, and walks in the darkness, and knows not where he goes, because the darkness has blinded his eyes.

General references

Leviticus 11:16
and the female ostrich and the male ostrich, and the sea-gull, and the hawk, after its kind;
Deuteronomy 29:4
But Jehovah hath not given you a heart to perceive, and eyes to see, and ears to hear, to this day.