Roderick Leupp describes the renewal of trinitarian theology in recent decades and introduces us to the trinitarian thought of theologians such as Karl Rahner, Karl Barth, Jurgen Moltmann, John Zizioulas, Robert Jenson and Catherine LaCugna. Leupp shows us how "trinitarian" is an adjective for the very grammar of the Christian faith. And he helps us see how our thinking about the Godhead, the cross, the church, ethics and spirituality can be transformed by trinitarian theology. Writing in a style that is always reflective, often poetic and sometimes deeply personal, Leupp puts theology in...