I want to share a couple of passages which were helpful to me.
37 But although He had done so many signs before them, they did not believe in Him, 38 that the word of Isaiah the prophet might be fulfilled, which he spoke:
“Lord, who has believed our report?
And to whom has the arm of the Lord been revealed?”
39 Therefore they could not believe, because Isaiah said again:
40 “He has blinded their eyes and hardened their hearts,
Lest they should see with their eyes,
Lest they should understand with their hearts and turn,
So that I should heal them.”
41 These things Isaiah said when he saw His glory and spoke of Him.
Wow! You can’t get any clearer than that. John says Isaiah saw the glory of Jesus Christ. It is worth reading Isaiah’s account of what he saw and who he saw.
1 In the year that King Uzziah died, I saw the Lord sitting on a throne, high and lifted up, and the train of His robe filled the temple. 2 Above it stood seraphim; each one had six wings: with two he covered his face, with two he covered his feet, and with two he flew. 3 And one cried to another and said:
“Holy, holy, holy is the Lord of hosts;
The whole earth is full of His glory!”
4 And the posts of the door were shaken by the voice of him who cried out, and the house was filled with smoke.
5 So I said:
“Woe is me, for I am undone!
Because I am a man of unclean lips,
And I dwell in the midst of a people of unclean lips;
For my eyes have seen the King,
The Lord of hosts.”