No greater pain has ever been experienced on any level than the hell of Christ suffering in this moment. But why? Because he carried all of that pain, sin, guilt, and shame in that moment. Yet on a far deeper level he was forsaken and punished for us to reconcile us to God (2 Cor. 5:18).

Tim Keller illustrates it this way:

If after a service some Sunday morning one of the members of my church comes to me and says, "I never want to see you or talk to you again," I will feel pretty bad. But if today my wife comes up to me and says, "I never want to see you or talk to you again," that's a lot worse. The longer the love, the deeper the love, the greater the torment of its loss.

But this forsakenness, this loss, was between the Father and the Son, who had loved each other from all eternity. … Jesus, the Maker of the world, was being unmade. Why? Jesus was experiencing Judgment Day. "My God, my God, why have you forsaken me?" It wasn't a rhetorical question. And the answer is: For you, for me, for us. Jesus was forsaken by God so that we would never have to be. The judgment that should have fallen on us fell instead on Jesus.