This coming August 3 will mark the golden anniversary of Flannery O’Connor’s “Passover,” to adopt the biblical image John Paul II used to describe the Christian journey through death to eternal life. In the fifty years since lupus erythematosus claimed her at age thirty-nine, O’Connor’s literary genius has been widely celebrated. Then, with the 1979 publication of The Habit of Being, her collected letters, another facet of O’Connor’s genius came into focus: Mary Flannery O’Connor was an exceptionally gifted apologist, an explicator of Catholic faith who combined remarkable insight into the mysteries of the Creed with deep and unsentimental piety, unblinking realism about the Church in its human aspect, puckish humor—and a mordant appreciation of the soul-withering acids of modern secularism.