There's a crisis of loneliness in the world, and a lot of it has to do with being closed off to other people. If we want to be open to other people, it means we need to live in a world that's big enough for people to disagree.
The book we mention is "The Seven Levels of Intimacy" by Matthew Kelly, flavored a little bit by Diedrich von Hildebrand's "Liturgy and Personality" and Mortimer Adler's "Aristotle for Everybody".