Joh 12:38 So that the word of the prophet Isaiah would be fulfilled, which said: “Lord, who has believed what we heard? And to whom has the arm of the Lord been revealed?”1
Joh 12:39 This is why they were unable to believe, because Isaiah said again:
Joh 12:40 “He has blinded their eyes and hardened their hearts, so that they would not see with their eyes or understand with their hearts, and turn, and I would cure them.”2
unable to believe
The crowds had no problem believing that Jesus was a miracle worker, but they were unable to believe the gospel which he preached. John explained this by referring back to Isaiah’s words. Isaiah was able to believe because God had revealed his glory to him. What people need in order to be converted is a vision of who God is. Otherwise, they will remain blind no matter what they see. Their hearts will not soften unless exposed to the presence of God.
Lord, show us how to pray unbelievers into your presence, so that they catch a glimpse of your glory.
2Isaiah 6:10; 29:10