John 12:39

Therefore they could not believe. For again Isaiah said,

John 5:44

How can you believe, when you receive glory from one another and do not seek the glory that comes from the only God?

Isaiah 6:9-10

And he said, "Go, and say to this people: "'Keep on hearing, but do not understand; keep on seeing, but do not perceive.'

Isaiah 44:18-20

They know not, nor do they discern, for he has shut their eyes, so that they cannot see, and their hearts, so that they cannot understand.

John 6:44

No one can come to me unless the Father who sent me draws him. And I will raise him up on the last day.

John 10:38

but if I do them, even though you do not believe me, believe the works, that you may know and understand that the Father is in me and I am in the Father."

2 Peter 2:14

They have eyes full of adultery, insatiable for sin. They entice unsteady souls. They have hearts trained in greed. Accursed children!

Treasury of Scripture Knowledge

Summary

Therefore they could not believe, because that Esaias said again,

Bible References

They

John 5:44
How can you believe, when you receive glory from one another and do not seek the glory that comes from the only God?
John 6:44
No one can come to me unless the Father who sent me draws him. And I will raise him up on the last day.
John 10:38
but if I do them, even though you do not believe me, believe the works, that you may know and understand that the Father is in me and I am in the Father."
Isaiah 44:18
They know not, nor do they discern, for he has shut their eyes, so that they cannot see, and their hearts, so that they cannot understand.
2 Peter 2:14
They have eyes full of adultery, insatiable for sin. They entice unsteady souls. They have hearts trained in greed. Accursed children!

General references

Exodus 10:20
But the LORDhardened Pharaoh's heart, and he did not let the people of Israel go.
Deuteronomy 29:4
But to this day the LORD has not given you a heart to understand or eyes to see or ears to hear.
John 1:5
The light shines in the darkness, and the darkness has not overcome it.
John 9:18
The Jews did not believe that he had been blind and had received his sight, until they called the parents of the man who had received his sight
John 10:37
If I am not doing the works of my Father, then do not believe me;

The Holy Bible, English Standard Version® copyright © 2001 by Crossway Bibles, a publishing ministry of Good News Publishers.