Karl Rahner SJ (1904-1984), perhaps the most influential figure in twentieth-century Roman Catholic theology, believed that the most significant influence on his work was Ignatius Loyola's Spiritual Exercises. This book casts significant new light on Rahner's achievement by presenting it against the background of the rediscovery of Ignatian spirituality in the middle decades of the twentieth century. It offers a fresh and contemporary theological interpretation of Ignatian retreat-giving, illuminating the creative new departures this ministry has taken in the last thirty years, as well as contributing to the lively current debate regarding the relationship between spirituality and speculative theology.