Karl Rahner has been the most influential Catholic theologian in this century. His writings helped to prepare the way for Vatican II and did much to shape the Church in the post-conciliar period. In this book, a former student of Rahner and fellow Jesuit interweaves passages from Rahner's writings with explanatory commentary, in this way providing an introduction to the theology and spirituality of Karl Rahner suitable for the newcomer. This volume uncovers the foundations of Rahner's thought, presenting his integral Christian vision and illuminating in particular the profound connection between his theology and mysticism.