Due to our present times where the heresy of Modernism runs rampant, this small collection by St. Pope Pius X includes The Oath Against Modernism (1910), Lamentabili Sane: Syllabus Condemning the Errors of the Modernists (1907), and Pascendi Dominici Gregis: On the Doctrine of the Modernists (1907)
Pope Saint Pius X (Ecclesiastical Latin: Pius PP. X), born Giuseppe Melchiorre Sarto, was the 257th Pope of the Catholic Church, serving from 1903 to 1914. He was the first pope since Pope Pius V to be canonized. Pius X rejected modernist interpretations of Catholic doctrine, promoting traditional devotional practices and orthodox theology. His most important reform was to publish the first Code of Canon Law, which collected the laws of the Church into one volume for the first time. Frequent communion was a lasting innovation of his papacy.