Mark 4:12

so that " 'They may look and look and yet not see, And listen and listen and yet not understand, Lest possibly they should turn and be forgiven.' ",

Matthew 13:14-15

They are a fulfilment of Isaiah's prophecy, " 'You will listen and listen, and never understand, And you will look and look, and never see!

Luke 8:10

And he said, "You are permitted to know the secrets of the Kingdom of God, but they are given to others in the form of figures, so that they may look and yet not see, and hear and yet not understand.

John 12:37-41

But for all the signs he had shown among them, they refused to believe in him,

Acts 3:19

So repent and turn to God, to have your sins wiped out, and happier times will come from the presence of the Lord,

Acts 28:25-27

As they could not agree among themselves, they started to leave, when Paul added one last word. "The holy Spirit put it finely," he said, "when it said to your forefathers through the prophet Isaiah,

Romans 11:8-10

The rest became callous; as the Scripture says, "God has thrown them into a state of spiritual insensibility, with eyes that cannot see and cars that cannot hear, that has lasted down to this day."

2 Timothy 2:25

correcting his opponents with gentleness; for God may possibly let them repent and acknowledge the truth,

Hebrews 6:6

and yet have fallen back, for they crucify the Son of God on their own account, and hold him up to contempt.

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
They are a fulfilment of Isaiah's prophecy, " 'You will listen and listen, and never understand, And you will look and look, and never see!
Luke 8:10
And he said, "You are permitted to know the secrets of the Kingdom of God, but they are given to others in the form of figures, so that they may look and yet not see, and hear and yet not understand.
John 12:37
But for all the signs he had shown among them, they refused to believe in him,
Acts 28:25
As they could not agree among themselves, they started to leave, when Paul added one last word. "The holy Spirit put it finely," he said, "when it said to your forefathers through the prophet Isaiah,
Romans 11:8
The rest became callous; as the Scripture says, "God has thrown them into a state of spiritual insensibility, with eyes that cannot see and cars that cannot hear, that has lasted down to this day."

Be converted

Acts 3:19
So repent and turn to God, to have your sins wiped out, and happier times will come from the presence of the Lord,
2 Timothy 2:25
correcting his opponents with gentleness; for God may possibly let them repent and acknowledge the truth,
Hebrews 6:6
and yet have fallen back, for they crucify the Son of God on their own account, and hold him up to contempt.