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John 12:38-40

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 in Jesus’ day had no difficulty believing in His miracles. They saw power, they saw signs, they saw wonders. What they could not believe was the message behind those signs—the gospel He preached. John reaches back to Isaiah to explain this tragic disconnect. Isaiah believed because God revealed His glory to him. His eyes were opened not by argument, but by encounter.

That is the heart of the matter. Conversion is not produced by evidence alone. People can witness miracles, hear sermons, read Scripture, and still remain unmoved. Without a revelation of who God is—without even a glimpse of His glory—the heart stays blind. The eyes remain closed. The soul remains untouched. Only the presence of God softens what is hard and awakens what is dead.

Isaiah’s vision of the Lord high and lifted up changed him forever. The same is true today. What unbelievers need most is not better explanations, but divine illumination. Not more information, but revelation. Not merely arguments, but the presence of God breaking through the fog of unbelief.

A prayer rises naturally from this truth:

Lord, show how to pray unbelievers into Your presence, so that they catch even a glimpse of Your glory.