Cardinal Kasper is a distinguished theologian who was a colleague of Cardinal Ratzinger, Karl Rahner, and Hans Kung at The Universities of Münster and Tübingen. Kasper now heads the Vatican's Council for Promoting Christian Unity, with the specific task of fostering relations between the Catholic Church and other Christian Churches and Ecclesial communities. Here he outlines his vision for the unity of Christian Churches. A man with an open mind, Kasper covers one of the major responsibilities of the contemporary Catholic Church. His perspective of the uniqueness of The Catholic Church and its magisterium is presented here as a modern inquiry into the nature of truth. His views are enlightening and engaging, and reflect the important role of dialogue as understood by the Catholic Church, which also listen to other traditions and learn from them. Many will read it in the hope that the thought of this renowned, open-minded Church leader may give hope to people of all traditions that they may learn to understand Jesus's injunction - 'they may be one'.