"True Devotion to Mary" is universally acclaimed as the single greatest and most theologically authoritative book on the Blessed Virgin Mary ever to have been written. This work has had a tremendous impact on a number of the most significant and influential popes, from the late 19th Century right down to our own times: (1) Pope Leo XIII beatified de Montfort in 1888, adopted de Montfort's Mariological terminology (calling Mary the "Mediatrix" and "Co-Redemptrix"), and wrote no less than ten encyclicals on the Rosary; (2) Pope Saint Pius X, in 1904, wrote his key Marian encyclical, "Ad Diem Illum," adopting much of the language and sentiment of de Montfort's book, "True Devotion," and even granted the Apostolic Blessing to all who would read de Montfort's great treatise on the Blessed Virgin (that is, the book you now hold in your hands ); (3) Pope Pius XII, also a deeply Marian pope, canonized de Montfort in 1947, raising him to the honors of the altar; and (4) our beloved Blessed Pope John Paul II, as many know, took his papal motto, "Totus Tuus," from de Montfort's Latin prayer of total consecration to the Blessed Virgin, stating that his reading of "True Devotion" marked a "decisive turning point" in his life and spirituality that would forever shape his person, priesthood and papacy. There has even been serious speculation regarding de Montfort being made a Doctor of the Church Clearly, this book is the definitive MUST READ for every Catholic Christian