John 12:39

Because of this they could not believe. Because Isaiah said again,

John 5:44

How can ye believe, who receive glory from each other, and seek not the glory from the only God?

Isaiah 6:9-10

And he said, Go, and tell this people, Hear ye indeed, but do not understand, and see ye indeed, but do not perceive.

Isaiah 44:18-20

They do not know, nor do they consider. For he has shut their eyes, that they cannot see, and their hearts, that they cannot understand.

John 6:44

No man can come to me unless the Father who sent me draws him, and I will raise him up in the last day.

John 10:38

But if I am doing them, even though ye do not believe me, believe the works, that ye may know and believe that the Father is in me, and I in the him.

2 Peter 2:14

having eyes full of adultery, and unceasing sin, enticing unstable souls, having a heart trained in greed, children of a curse,

Treasury of Scripture Knowledge

Summary

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

Bible References

They

John 5:44
How can ye believe, who receive glory from each other, and seek not the glory from the only God?
John 6:44
No man can come to me unless the Father who sent me draws him, and I will raise him up in the last day.
John 10:38
But if I am doing them, even though ye do not believe me, believe the works, that ye may know and believe that the Father is in me, and I in the him.
Isaiah 44:18
They do not know, nor do they consider. For he has shut their eyes, that they cannot see, and their hearts, that they cannot understand.
2 Peter 2:14
having eyes full of adultery, and unceasing sin, enticing unstable souls, having a heart trained in greed, children of a curse,

General references

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