Karl Rahner (1904-84), a Jesuit priest, was arguably the most significant Catholic theologian of the twentieth century. A major influence at Vatican II, his writings effected a paradigm shift in modern theology. And yet, as many admirers have only come to realize, it was the experience of prayer that animated and inspired his scholarly activity. Rahner's theology was driven by a passion to articulate what the human person must be like of prayer is possible, if we human beings can really make contact with God. As this anthology shows, Rahner was an important theologian, but only because he was more fundamentally a modern spiritual master.