psychology, Gómez Pereira is, without a doubt, more advanced than his time, more than the seventeenth century, more than Bacon, more than Descartes. None noted the phenomenon of his intelligence. Novae veraeque Medicinae Novae veraeque Medicinae is a medical treatise that focuses on the study of fevers [its causes and types] as well as other specific diseases like leprosy and smallpox. In this work, which he dedicated to Prince Don Carlos, Pereira challenges the tradition of Aristotle and Galen, as well as the medieval tradition of "magister dixit". His is an entirely empirical and rational method, based in his experience as a physician. The healing methods are simple, and the doctor, because of his method and experience, is the final criterion of truth (as opposed to truths of religion or faith). "In no case of religious things will I give the opinion and sentence of some philosopher if it is not based on reason." Gómez Pereira felt that the heat generated by a fever is the body's defense mechanism to remove the damage that affects it and, thus, nature restores the natural balance of any body, a surprisingly modern conception of fever as a reaction against disease. As for his studies of diseases such as leprosy or smallpox, Pereira's conclusions were later commended by the physician and historian Antonio Hernández Morejón. Antoniana Margarita Antoniana Margarita was reprinted many times but only very recently translated into Spanish (2000, from the original Latin). The work is dedicated to his teacher Juan Martínez Siliceo and is a tribute to his parents, Antonio and Margarita, even though the subtitle of clearly indicates its scientific and philosophical contents: "a work so useful and necessary for medical, physical, and theologians ("Opus nempe phisicis, ac medicis teologis, non minus utile quam necessarium"). A difficult text to read because there are no chapters or paragraphs, the document uses the language of the "christianos nuevos" (New Christians) to explore new ideas from empiricism and materialism, possibly an effort to hide potentially controversial and blasphemous methods of reasoning (16th Century Castile, the Council of Trent had already begun). Thus, the Pereira did not venture to develop the logical conclusions to their fullest extent. It is a philosophical treatise that addresses three key issues: the "automatism of beasts"; the theory of human knowledge; the immortality of the soul. The insensibility of animals Pereira's paradigm is typical of the Christian humanism of