Book excerpt: Karl Rahner, a Jesuit Priest who died in 1984, is widely regarded as one of the most influential Catholic theologians of the 20th century. His writings played an enormous role in shaping the documents of Vatican II. But while he is best known for his academic theology, his deepest goal was to help ordinary Christians to recognize and respond to the presence of grace in their everyday lives. Rahner famously observed that the Christians of the future will be mystics or there will be no Christianity. With readings for Advent, Lent, and the other liturgical seasons, these sermons, prayers, and reflections offer spiritual nourishment for the whole year.