 So that they're used to understand the world when they are extremely revealing, but also when they're as obscuring as they are revealing. And if they're used all the time as prisms for and dancers to everything, there's no way for people in different places to hear each other's voices or understand where they might have areas of agreement or to understand when they're being unreasonable. Our guest is Frank Bruni, author of the book, The Age of Grievance.