We analyzed part of Suma Theologiae’s Vices and Sins by Thomas Aquinas (1224? -1274). We intended to highlight and consider aspects related to the knowledge production, education and moral formation of novices from the Order of Preachers in the thirteenth century. The Summa Theologiae is a theology compendium that has been read, fought and defended over the centuries. We believe that by highlighting its internal structure and the arrangement of the arguments employed by Thomas Aquinas we may provide an important instrument to studies on these elements. Based on the deadly sins, we came to the conclusion that, for instance, we can analyze moral and theological issues concerning sin and the development process of a work that is proposed as a compendium to organize the disorder in which the sacred science was, according to the theologian.