Isaiah 6:9-10

6:9 He said, “Go and tell these people:

‘Listen continually, but don’t understand!

Look continually, but don’t perceive!’

6:10 Make the hearts of these people calloused;

make their ears deaf and their eyes blind!

Otherwise they might see with their eyes and hear with their ears,

their hearts might understand and they might repent and be healed.”

Isaiah 42:18-20

The Lord Reasons with His People

42:18 “Listen, you deaf ones!

Take notice, you blind ones!

42:19 My servant is truly blind,

my messenger is truly deaf.

My covenant partner, the servant of the Lord, is truly blind.

42:20 You see many things, but don’t comprehend;

their ears are open, but do not hear.”

Isaiah 44:18-20

44:18 They do not comprehend or understand,

for their eyes are blind and cannot see;

their minds do not discern.

44:19 No one thinks to himself,

nor do they comprehend or understand and say to themselves:

‘I burned half of it in the fire –

yes, I baked bread over the coals;

I roasted meat and ate it.

With the rest of it should I make a disgusting idol?

Should I bow down to dry wood?’

44:20 He feeds on ashes;

his deceived mind misleads him.

He cannot rescue himself,

nor does he say, ‘Is this not a false god I hold in my right hand?’

Matthew 13:14-15

13:14 And concerning them the prophecy of Isaiah is fulfilled that says:

You will listen carefully yet will never understand,

you will look closely yet will never comprehend.

13:15 For the heart of this people has become dull;

they are hard of hearing,

and they have shut their eyes,

so that they would not see with their eyes

and hear with their ears

and understand with their hearts

and turn, and I would heal them.

Romans 11:7-10

11:7 What then? Israel failed to obtain what it was diligently seeking, but the elect obtained it. The rest were hardened, 11:8 as it is written,

“God gave them a spirit of stupor,

eyes that would not see and ears that would not hear,

to this very day.”

11:9 And David says,

“Let their table become a snare and trap,

a stumbling block and a retribution for them;

11:10 let their eyes be darkened so that they may not see,

and make their backs bend continually.”

Romans 11:25

11:25 For I do not want you to be ignorant of this mystery, brothers and sisters, so that you may not be conceited: A partial hardening has happened to Israel until the full number of the Gentiles has come in.

Romans 11:2

11:2 God has not rejected his people whom he foreknew! Do you not know what the scripture says about Elijah, how he pleads with God against Israel?

Colossians 3:14

3:14 And to all these virtues add love, which is the perfect bond.

Ephesians 4:18

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