See this online ebook:
- Summa Theologica [or Summa Theologiae], by Saint Thomas Aquinas, translated by the Fathers of the English Dominican Province (Second and Revised Edition, 1920). With Imprimatur. May be read on on this page of New Advent, with links to quoted passages of the Sacred Scriptures and relevant Catholic Encyclopedia articles. Another edition (Benziger Bros., 1947) may be read on this page of the Dominican House of Studies, Priory of the Immaculate Conception. The parallel Latin and English texts, the latter from the Dominican translation, may be read on this page (Part I, Part IIa, Part IIb, Part III) of the Logic Museum Wiki and on this page of the old Logic Museum.
On the Feast of St. Thomas Aquinas in the Extraordinary Form of the Roman Rite. For other legally free ebooks, you may access the List of Free eBooks (Arranged by Title) and the List of Free eBooks (Grouped by Subject).
“[I]n order that they may illumine the mysteries of salvation as completely as possible, the students should learn to penetrate them more deeply with the help of speculation, under the guidance of St. Thomas…” (Second Vatican Council, Decree on Priestly Training “Optatam Totius”, 16)