”Jesus is the window into God.” Michael Green.
John makes a remarkable statement about Isaiah (41), but it is even more a staggering assertion about Christ. It probably refers to the vision of God’s glory the prophet saw, recorded in chapter 6 of the book that bears his name. John says that in fact he ”saw Jesus’ glory and spoke about him.” To see Jesus, is to see the Father (44, 45; 14:9).
I find it helpful, in looking at verses 37-41, to see that it first says ”they…would not believe in him” (37) before it says ”they could not believe” (39). There are ‘none so blind as those who will not see.’ You can’t see if you won’t see, and in the previous section Jesus had warned about making the most of ”the light” while they still had it (35, 36). There can come a time when our hearts are so hardened that we cannot repent, and ultimately all must face judgment (48).
Yet again though, Jesus was not met with wall to wall spiritual blindness (42). There were ”many even among the leaders” who believed. However, it was a response without backbone. Something was lacking. As Bishop J.C. Ryle said, a soldier is not ashamed of his uniform.