Deuteronomy 29:4

Yet the LORD has not given you a heart to perceive, and eyes to see, and ears to hear, unto this day.

Acts 28:26-27

Saying, Go unto this people, and say, Hearing you shall hear, and shall not understand; and seeing you shall see, and not perceive:

Isaiah 6:9-10

And he said, Go, and tell this people, Hear you indeed, but understand not; and see you indeed, but perceive not.

Isaiah 63:17

O LORD, why have you made us to err from your ways, and hardened our heart from your fear? Return for your servants' sake, the tribes of your inheritance.

John 8:43

Why do you not understand my speech? even because you cannot hear my word.

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:

Deuteronomy 2:30

But Sihon king of Heshbon would not let us pass by him: for the LORD your God hardened his spirit, and made his heart obstinate, that he might deliver him into your hand, as it is this day.

Proverbs 20:12

The hearing ear, and the seeing eye, the LORD has made even both of them.

Ezekiel 36:26

A new heart also will I give you, and a new spirit will I put within you: and I will take away the stony heart out of your flesh, and I will give you a heart of flesh.

Matthew 13:11-15

He answered and said unto them, Because it is given unto you to know the mysteries of the kingdom of heaven, but to them it is not given.

John 12:38-40

That the saying of Isaiah the prophet might be fulfilled, which he spoke, Lord, who has believed our report? and to whom has the arm of the Lord been revealed?

Romans 11:7-10

What then? Israel has not obtained that which it seeks for; but the election has obtained it, and the rest were blinded

2 Corinthians 3:15

But even unto this day, when Moses is read, the veil is upon their hearts.

2 Thessalonians 2:10-12

And with all deception of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved.

2 Timothy 2:25

In meekness instructing those that oppose them; if God perhaps will give them repentance to the acknowledging of the truth;

James 1:13-17

Let no man say when he is tempted, I am tempted of God: for God cannot be tempted with evil, neither tempts he any man:

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