Matthew 13:14

And in regard to them the prophecy of Isaiah is receiving signal fulfilment: "'You will hear and hear and by no means understand, and you will look and look and by no means see.

Mark 4:12

that "'They may look and look but not see, and listen and listen but not understand, lest perchance they should return and be pardoned.'"

Luke 8:10

"To you," He replied, "it is granted to know the secrets of the Kingdom of God; but all others are taught by parables, in order that they may see and yet not see, and may hear and yet not understand.

Luke 8:10

"To you," He replied, "it is granted to know the secrets of the Kingdom of God; but all others are taught by parables, in order that they may see and yet not see, and may hear and yet not understand.

John 12:39-40

For this reason they were unable to believe--because Isaiah said again,

Acts 28:25-27

Unable to agree among themselves, they at last left him, but not before Paul had spoken a parting word to them, saying, "Right well did the Holy Spirit say to your forefathers through the Prophet Isaiah:

Romans 11:8-10

And so Scripture says, "God has given them a spirit of drowsiness--eyes to see nothing with and ears to hear nothing with--even until now."

2 Corinthians 3:14

Nay, their minds were made dull; for to this very day during the reading of the book of the ancient Covenant, the same veil remains unlifted, because it is only in Christ that it is to be abolished.

Treasury of Scripture Knowledge

Summary

And in them is fulfilled the prophecy of Esaias, which saith, By hearing ye shall hear, and shall not understand; and seeing ye shall see, and shall not perceive:

General references

Bible References

The prophecy

Mark 4:12
that "'They may look and look but not see, and listen and listen but not understand, lest perchance they should return and be pardoned.'"
Luke 8:10
"To you," He replied, "it is granted to know the secrets of the Kingdom of God; but all others are taught by parables, in order that they may see and yet not see, and may hear and yet not understand.
John 12:39
For this reason they were unable to believe--because Isaiah said again,
Acts 28:25
Unable to agree among themselves, they at last left him, but not before Paul had spoken a parting word to them, saying, "Right well did the Holy Spirit say to your forefathers through the Prophet Isaiah:
Romans 11:8
And so Scripture says, "God has given them a spirit of drowsiness--eyes to see nothing with and ears to hear nothing with--even until now."
2 Corinthians 3:14
Nay, their minds were made dull; for to this very day during the reading of the book of the ancient Covenant, the same veil remains unlifted, because it is only in Christ that it is to be abolished.

General references

Matthew 24:39
nor did they realise any danger till the Deluge came and swept them all away; so will it be at the Coming of the Son of Man.