John 8:27

They understood not that he spoke to them of the Father.

John 8:43

Why do you not understand my speech? because you cannot hear my word.

John 8:47

He that is of God hears the words of God; you, therefore, hear not, because you are not of God.

Romans 11:7-10

What then? What Israel seeks, this it did not obtain, but the election obtained; and the rest were hardened,??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??o this day.

2 Corinthians 4:3-4

But if our gospel is vailed it is vailed among the lost,

Treasury of Scripture Knowledge

Summary

They understood not that he spake to them of the Father.

Bible References

General references

John 8:43
Why do you not understand my speech? because you cannot hear my word.
Romans 11:7
What then? What Israel seeks, this it did not obtain, but the election obtained; and the rest were hardened,??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??o this day.
2 Corinthians 4:3
But if our gospel is vailed it is vailed among the lost,