Mark 4:12

so that 'seeing they may see but not perceive, and hearing may hear but not understand; lest they should turn again, and be forgiven.'"

Matthew 13:14-15

In them is fulfilled the prophecy of Isaiah which says: 'Hearing you will hear and shall not understand; and seeing you will see and not perceive.

Luke 8:10

he said, "To you it has been given to know the secrets of the kingdom of God; but to others it is given in parables, so that 'Seeing they may not see, and hearing they may not understand.'

John 12:37-41

Though he had done so many signs before them, yet they did not believe in him;

Acts 3:19

Repent therefore, and turn again, so that your sins may be wiped out, that times of refreshing may come from the presence of the Lord,

Acts 28:25-27

When they disagreed among themselves, they began to leave, after Paul had made one final statement: "The Holy Spirit spoke the truth to your fathers through Isaiah the prophet:

Romans 11:8-10

as it is written: "God gave them a spirit of stupor, eyes that they should not see and ears that they should not hear, down to this very day."

2 Timothy 2:25

with gentleness correcting those who are in opposition, if perhaps God will grant them repentance leading to the knowledge of the truth,

Hebrews 6:6

and then have fallen away, to renew them again to repentance, since they crucify again for themselves the Son of God, and put him to an open shame.

Treasury of Scripture Knowledge

Summary

That seeing they may see, and not perceive; and hearing they may hear, and not understand; lest at any time they should be converted, and their sins should be forgiven them.

Bible References

That seeing

Matthew 13:14
In them is fulfilled the prophecy of Isaiah which says: 'Hearing you will hear and shall not understand; and seeing you will see and not perceive.
Luke 8:10
he said, "To you it has been given to know the secrets of the kingdom of God; but to others it is given in parables, so that 'Seeing they may not see, and hearing they may not understand.'
John 12:37
Though he had done so many signs before them, yet they did not believe in him;
Acts 28:25
When they disagreed among themselves, they began to leave, after Paul had made one final statement: "The Holy Spirit spoke the truth to your fathers through Isaiah the prophet:
Romans 11:8
as it is written: "God gave them a spirit of stupor, eyes that they should not see and ears that they should not hear, down to this very day."

Be converted

Acts 3:19
Repent therefore, and turn again, so that your sins may be wiped out, that times of refreshing may come from the presence of the Lord,
2 Timothy 2:25
with gentleness correcting those who are in opposition, if perhaps God will grant them repentance leading to the knowledge of the truth,
Hebrews 6:6
and then have fallen away, to renew them again to repentance, since they crucify again for themselves the Son of God, and put him to an open shame.