Links to On-line Texts of St. Thomas Aquinas.

• Corpus Thomisticum, collected and maitained by Enrique Alarcón at the Universidad de Navarra, Spain.  The texts are grouped in blocks of several chapters or questions.  The site also has other useful information including a bibliography. 
• Thomae Aquinatis Opera Omnia, collected and maintained by Matthew Caughron, alumnus of Thomas Aquinas College in Santa Paula, Californa.  Each text is in available as a separate text file which may facilitate searches.

Individual Texts of Aquinas: English Title - Latin Title (Date of composition.)

• On the Principles of Nature - De Principiis Naturae (1252-56).
  • Latin (English translation in progress.)
• On Being and Essence - De Ente et Essentia (1252-56)
  • English.
  • Latin.
  • Latin.
  • Latin.
  • Latin.
  • Latin.
  • Latin.
  • Latin.
  • Russkiy Yazik (Russian).
• On the Truth of the Catholic Faith - Summa contra Gentiles (1259-64).
  • English.
  • Latin - Liber IV, Cap. 2-26.
• Disputed Questions on the Power of God - Quaestiones Disputate de Potentia Dei (1265-66)
  • Français. [qq. 1, 3, 4 & 5]
  • Portugués [qq. 1 - 2]
• Summa of Theology - Summa Theologiae (1266-73)
  • English.
  • Français.
  • Latin. [Ia, qq. 1 - 74]
• Disputed Questions on the Soul - Quaestiones Disputatae de Anima (1269)
  • Latin
  • Latin
  • Latin
• On the Eternity of the World - De Aeternitate Mundi (1270).
  • English.
  • Castellano, Latin and English.
• On the Unity of the Intellect against the Averroists - De Unitate Intellctus contra Averroista (1270)
  • English.
  • Latin.
• On the Motion of the Heart - De Motu Cordis (1270-71)
  • Latin and English.
• On the Mixing of the Elements - De Mixione Elementorum (1270-71)
  • Latin.
  • Latin and English.
• On Lots - De Sortibus (1271)
  • Latin.
• Commentary on the Psalms - Postilla super Psalmos (1272-73).
  • Latin and English
  • Français
• Disputed Question on the Union of the Word Incarnate - Quaestio Disputata de Unione Verbi Incarnati (1272, but see note.)
  • Latin/English - Art. 1.
  • Latin/English - Art. 2.
  • Latin/English - Art. 3.
  • Latin/English - Art. 4.
• On Judging of the Stars -  De Iudiciis Astrorum
  • Latin.
• On the Principle of Individuation - De Principio Individuationis
  • Latin.
• On the Method of Studying - De Modo Studendi
  • Latin.

Other sites with links to Thomistic texts (from which most of the above links are drawn).

• Thomas Aquinas in English - A complete bibliography compiled and maintained by Thérèse Bonin.
• The Aquinas Translation Project - Dr. Stephen Loughlin, Director.
• Robert Pasnau's Aquinas Latinus.
• Thomas Instituut
• Polish Dominican Province.
• Dominican Province of Toulouse.
• Thomistic Links of Esteban Trento, the most complete list of materials by or about Aquinas on the Web.