John 12:36-43 fulfills the prophecy of Isaiah that many people would harden their hearts and reject the Savior. Pastor Paul van Engelenhoven describes the biblical basis of the doctrine, evidence for the doctrine in the Old and New Testament, evidence in church history, and the urgent call of the Holy Spirit. “But because of your hard and impenitent heart you are storing up wrath for yourself on the day of wrath when God’s righteous judgment will be revealed.”