This study shows how the theology of Hans Urs von Balthasar sheds new light on the controverted question of God's immutability, and succeeds in respecting both the transcendence and immanence of God. In the course of outlining the distinctiveness of von Balthasar's treatment of this question, O'Hanlon introduces the reader to the Christology, eschatology, and fundamental theological themes of one of the major Roman Catholic theologians of this century, who is still relatively unknown in the English-speaking world.