We are made for fellowship—fellowship with God and with others. None of us can know who we are by looking only at what is inside us and ignoring our relationships—after all, Christ asks us to be in the world but not of it. This is where sociology, the study of how we fit into groups, comes in. Matthew Vos offers an introduction to sociology and describes how sociology sees and studies the world, the world’s issues, and our own troubles—all with the goal of bringing new depth to our understanding of our relationships with God and the world.