Can someone help please and thank u! Paragraph 22 also gives a reason for suffering. What is the value of "God's megaphone" according to this paragraph?

Paragraph 22: Pain, God's megaphone, can drive me away from him. I can hate God for allowing such misery. Or, on the other hand, it can drive me to him. I can believe him when he says this world is not all there is, and take the chance that he is making a perfect place for those who follow Him on pain-wracked earth. If you once doubt the megaphone value of suffering, visit the intensive-care ward of a hospital. It's unlike any other place in the world. All sorts of people will pace the lobby floors. Some rich, some poor. There are beautiful, plain, black, white, smart, dull, spiritual, atheistic, white-collar, and blue-collar people. But the intensive-care ward is the one place in the world where none of those divisions makes a speck of difference, for all those people are united by a single awful thread--their love for a dying relative or friend. You don't see sparks of racial tension there. Economic differences, even religious differences fade away. Often they'll be consoling one another or crying quietly. All of them are facing the rock-bottom emotions of life, and many of them call for a pastor or priest for the first time ever. Only the megaphone of pain is strong enough to bring these people to their knees and make them reconsider life.