“Prayers for a Lifetime, the last and most personal book of Karl Rahner . . . contains prayers from different phases of Rahner’s life, highly personal meditations and reflections on different points of Catholic teaching. There is in his life and writings an intimate connection between theology and spirituality or piety. As he himself said at one time, abstract theology ends up in a vacuum if it cannot rise from mere words about a particular topic to prayer. These reflections should serve all, learned and unlearned, as a guide to prayer.”