The Twenty-Four Thomistic Theses are a very good synthesis of Aquinas' philosophy. Although it is possible to disagree with them as to their wording, number, importance, etc., it is difficult to do so without transgressing the truth of their content. They include both metaphysics and cosmology, biology, psychology and theodicy formulated in a Thomistic key. Originally, they were considered the fundamental principles for understanding the doctrine of the Angelic Doctor and thinking in terms of it. Indeed, they are. There is no doubt that they can be extended. The eminent philosopher Canals Vidal has increased their number to 81. In this new volume of the Series, we study the history of these Theses and develop an explanation of their content in an Introduction and 31 1-Historical context. 2-Genesis. 3-Juridical-canonical character. 4-St. Thomas and Francisco Suárez. 5-Presentation of the Theses. 6-First Thesis. 7-Second Thesis. 8-Third Thesis. 9-Fourth Thesis. 10-Fifth Thesis. 11-Sixth Thesis. 12-Seventh Thesis. 13-Eighth Thesis. 14-Ninth Thesis. 15-Tenth Thesis. 16-Eleventh Thesis. 17-Twelfth Thesis. 18-Thirteenth Thesis. 19-Fourteenth Thesis. 20-Fifteenth Thesis. 21-Sixteenth Thesis. 22-Seventeenth Thesis. 23-Eighteenth Thesis. 24-Nineteenth Thesis. 25-Twentieth Thesis. 26-Twenty-First Thesis. 27-Twenty-Second Thesis. 28-Twenty-Third Thesis. 29-Twenty-Fourth Thesis. 30-The complementary theses. 31-Comparison between Thomistic and Suaretian theses. As usual, we conclude with an Epilogue in the form of questions and answers.