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[Selected collection of major philosophical works by Descartes, the father of modern philosophy] [Rene Descartes is a French philosopher, scientist and mathematician, and one of the founders of modern Western philosophical thought] World Classics: Descartes' thought is the first complete rationalist philosophical system in the history of philosophy, and Descartes himself became the pioneer of modern rationalism. This collection of works includes major philosophical works such as "Rules for Guiding the Mind", "Principles of Philosophy", "Introduction to Methods", "The World·On Light", "On Optics", "Passion of the Soul", "Meditations on First Philosophy". Descartes is famous for his theory that I think, therefore I am. Starting from the principle of cogito, he derived the proof of the existence of the material world with the help of intuition and deduction. Descartes did not want this metaphysics to exist independently of his scientific research, however, and he had important explorations in fundamental physics, mathematics, psychology, and optics.