This book examines the theological epistemologies of two of this century's most prominent theologians, Hans Urs von Balthasar and Karl Barth. Both theologians responded to modernist theologies by drawing from the best of their own traditions. Both tried to reinstate theology as a true science which takes its object, namely, the revelation of God in Jesus Christ, seriously. They therefore make excellent conversation partners. This book closely traces their arguments as they seek to formulate their understanding of theological knowledge and theological science from a christological and trinitarian perspective, based on the concrete self-disclosure of God in Jesus Christ.