Last July, the II International Congress of Tomista Philosophy took place, organized by the Center for Tomistic Studies of the Santo Tomás University of Santiago, Chile. As part of the events, the first volume of the Latin-Castilian bilingual edition of the Commentary on Psalms was presented. First, Professor Enrique Alarcón, editor of the Latin text and author of the Introduction, intervened. Professor Carlos A. Casanova spoke later, responsible for the Spanish version and the text notes. We then offer the presentation of Professor Casanova and the text of Professor Alarcón’s Introduction.