While on a red-eye flight to Washington, DC, opinion writer Arthur Brooks overheard an elderly woman whisper to her husband, “It’s not true that no one needs you anymore.” The man murmured something about wishing he were dead, and his wife replied, “Oh, stop saying that.” When the flight ended, Brooks turned around and immediately recognized the man. He was a world-famous hero. Other passengers shook his hand, and the pilot thanked him for the courage he displayed decades ago. How had this giant sunk into despair?

Elijah bravely and single-handedly defeated 450 prophets of Baal. That was the problem. He…