Title Latin Title Author Title Latin Title Author On the Study of Sacred Scripture Providentissimus Deus Pope Leo XII On the Retoration of Christian Philosophy Aeterni Patris Pope Leo XII The Conditions of the Working Classes Rerum Novarum Pope Leo XII Freemasonry Humanum Genus Pope Leo XII On the Teaching of Christian Doctrine Acerbo Nimis Pope Pius X On the Doctrines of the Modernists Pascendi Dominici Gregis Pope Pius X On Motion Pictures Pope Pius XI On Social Reconstruction Pope Pius XI On Atheistic Communism Pope Pius XI On Christian Marriage Pope Pius XI On Christian Education of Youth Pope Pius XI On Holy Virginity Pope Pius XII Christian Worship Mediator Dei Pope Pius XII The Assumption of the Blessed Virgin Mary Pope Pius XII On the Sacred Liturgy Mediator Dei Pope Pius XII Promotion of Biblical Studies Divino Afflante Spiritu Pope Pius XII On Motion Pictures, Radio and Television Miranda Prorsus Pope Pius XII Concerning some false opinions which threaten to undermine Catholic Doctrine Humani Generis Pope Pius XII The Mystical Body of Christ and our Union in it with Christ Mystici Corporis Pope Pius XII Title Latin Title Author On the Appearance of the Immaculate Virgin Mary at Lourdes Pope Pius XII False Trends in Modern Teaching Pope Pius XII On the Function of the state in the Modern World Pope Pius XII Re-Evaluation of the Social Question in the light of Christian Teaching Mater et Magistra Pope John XXIII From the Beginning of Our Priesthood Sacerdotii Nostri Primordia Pope John XXIII Christianity and Social Progress Mater et Magistra Pope John XXIII Peace on Earth Pacem in Terris Pope John XXIII The Doctrine and Worship of the Holy Eucharist Mysterium Fidei Pope Paul VI Decree on Priestly Training Pope Paul VI Fostering the Development of Peoples Populorum Progressio Pope Paul VI Devotion to the Blessed Virgin Mary Marialis Cultus Pope Paul VI The Church in the Modern World Ecclesiam Suam Pope Paul VI The Great Sign Signum Magnum Pope Paul VI On the Regulation of Birth Humanae Vitae Pope Paul VI Letter to Families John Paul II The Social Teaching of the Church Centesimus Annus John Paul II The Splendor of Truth John Paul II The Role of the Christian Family in the Modern World Familiaris Consortio John Paul II On Care of our Common Home Laudato Si Pope Francis.