"پرینکیپیا متافیزیکا" (Principia Metaphysica) is a philosophical work by رنه دکارت that explores the fundamental nature of reality and existence. It delves into concepts such as substance, causation, and the relationship between mind and body, laying the groundwork for modern metaphysics. The text emphasizes the importance of reason and skepticism in understanding the world. Dکارت argues for the existence of a thinking self, famously stating, "I think, therefore I am." This work has significantly influenced subsequent philosophical thought and discussions on the nature of being and knowledge.