In Cheerfulness, veteran radio host and author Garrison Keillor reflects on a simple virtue that can help us in this stressful and sometimes gloomy era. Drawing on personal anecdotes from his young adulthood into his eighties, Keillor sheds light on the immense good that can come from a deliberate work ethic and a buoyant demeanor. "Adopting cheerfulness as a strategy does not mean closing your eyes to evil," he tells us; "it means resisting our...