Matthew 13:15

For the heart of this people has become fat; and with their ears they hear heavily; and their eyes they have closed; lest they should see with their eyes, and hear with their ears, and understand with their heart, and should turn to me, and I should give them health.

Hebrews 5:11

Of him we have many things to say, and difficult to be explained, if we do say them, since you are slow in understanding.

John 8:43-44

Why do you not know what I say? Because you can not understand my words.

2 Timothy 4:4

and they will turn away their ears from the truth, and be turned to fables.

Mark 4:12

that they may surely see, and not perceive; and that they may surely hear, and not understand; lest they should turn to me, and their sins should be forgiven them.

Acts 3:19

Repent, therefore, and turn, in order that your sins may be blotted out, so that seasons of refreshing may come from the presence of the Lord,

Acts 7:57

And they cried out with a loud voice, and stopped their ears, and, with one consent, rushed upon him,

2 Thessalonians 2:10-11

and with all the delusion of unrighteousness in those who perish, because they did not receive the love of the truth, in order that they might be saved.

2 Timothy 2:25-26

in meekness instructing those who oppose themselves, if, possibly, God may give them repentance in order to the acknowledgment of the truth,

Hebrews 6:4-6

For it is impossible to renew again to repentance those who have once been enlightened, and have tasted of the heavenly gift, and have been made partakers of the Holy Spirit,

Revelation 22:2

In the midst of the street of the city, and on each side of the river, was the tree of life, which bore twelve kinds of fruit, and yielded its fruit every month; and the leaves of the tree were for the healing of the nations.

Treasury of Scripture Knowledge

Summary

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.

General references

Bible References

Ears

John 8:43
Why do you not know what I say? Because you can not understand my words.
Acts 7:57
And they cried out with a loud voice, and stopped their ears, and, with one consent, rushed upon him,
2 Timothy 4:4
and they will turn away their ears from the truth, and be turned to fables.
Hebrews 5:11
Of him we have many things to say, and difficult to be explained, if we do say them, since you are slow in understanding.

And should be

Acts 3:19
Repent, therefore, and turn, in order that your sins may be blotted out, so that seasons of refreshing may come from the presence of the Lord,
2 Timothy 2:25
in meekness instructing those who oppose themselves, if, possibly, God may give them repentance in order to the acknowledgment of the truth,
Hebrews 6:4
For it is impossible to renew again to repentance those who have once been enlightened, and have tasted of the heavenly gift, and have been made partakers of the Holy Spirit,

And i

Mark 4:12
that they may surely see, and not perceive; and that they may surely hear, and not understand; lest they should turn to me, and their sins should be forgiven them.
Revelation 22:2
In the midst of the street of the city, and on each side of the river, was the tree of life, which bore twelve kinds of fruit, and yielded its fruit every month; and the leaves of the tree were for the healing of the nations.

General references

Matthew 24:39
and knew not, till the flood came and took them all away: so shall be the coming of the Son of man.