Abstract

We want to study the expansion of subjectivity in Descartes' philosophy, so we all know that subjectivity is the foundation of the human self in the realms of epistemology, cosmology, ethics, art, religion, and science. This article shows that Descartes's general skepticism led him to subjectivity because after he doubted everything, he found himself as the first and only certain being, and then he considered the principle of "I think, therefore I am" (_Cogito_) as the foundation of cognition and every being in the world, including the being of God and corporal substances. Descartes considered the human reason to be independent of everything other than reason itself respecting the matter (problem) of cognition, and, in this direction, he resorts to the mental innate concepts to shape the scientific construction itself. Subjectivity (the human self) embraces all aspects of Descartes' philosophy, and in this philosophy, the whole world appears as a set of objects, and the universe (cosmos) has no other truth than the image that the human being made from it. Therefore, the only real subject is nothing but the human self. Descartes' subjectivity changed the course of modern philosophy, and later philosophers philosophized in that direction. Descartes's philosophy, and in particular his epistemology, is based on the mind. It begins with the mind and continues with the mind, and ends with the human mind. And this is the culmination of the broad scope of subjectivism in René Descartes's philosophy, and our goal was to emphasize the breadth of subjectivism.