See this online text:
- Encyclical “Pascendi Dominici Gregis” on the Doctrines of the Modernists, by Pope St. Pius X, September 8, 1907. Available online (on this page) of Catholic Culture, at the Holy See, at Papal Encyclicals Online, and at Internet Archive. A facsimile of the printed text (London: Burns & Oates) is available in pdf, epub, mobi/kindle and other formats at Internet Archive.
- The content of the encyclical is arranged in question-and-answer form in this work: Catechism on Modernism according to the Encyclical ‘Pascendi dominici gregis’ of His Holiness Pius X, from the French of Jean Baptiste Lemius, translated by John Fitzpatrick (London, Glasgow: R. & T. Washbourne; New York, Cincinnati, Chicago: Benziger Brothers, 1908). With Imprimatur. Available in pdf, epub, mobi/kindle and other formats at Internet Archive, Internet Archive; and in pdf format at Today’s Catholic World. [N.B., The last-mentioned website denies the hermeneutic of continuity and reform propounded by Pope Benedict XVI. Please approach its other contents with prayerful caution.]
- The Latin text and a different English translation is contained in this text, which does not use the incipit in its title: The Encyclical of His Holiness Pius X on the Doctrines on the Modernists: Latin Text and English Version, with Annotations by Thomas E. Judge. Available in pdf, epub, mobi/kindle and other formats at Internet Archive. The paperback is offered for sale at Amazon.com.
- See also these relevant essays:
Posted on the Feast of the Ecumenical Teachers and Hierarchs, Saint Basil the Great, Saint Gregory the Theologian, and Saint John Chrysostom, in the Eastern Catholic churches of the Byzantine Rite: in earnest prayer that, like them, we shall reverently study divine truth as preserved in sacred tradition, and resolutely uphold it against the errors, sins, and novelties of the world.
“Do not forget those who have had charge of you, and preached God’s word to you; contemplate the happy issue of the life they lived, and imitate their faith. What Jesus Christ was yesterday, and is to-day, he remains for ever. Do not be carried aside from your course by a maze of new doctrines” (Hebrews xiii, 7-9)
“[K]eep that which is committed to thy trust, avoiding the profane novelties of words and oppositions of knowledge falsely so called. Which some promising, have erred concerning the faith.” (I Timothy vi, 20-21)