Project Gutenberg 2008-12-14 Public domain in the USA. 296 Descartes, René 1596 1650 Descartes, Rene Fischer, Ludwig Betrachtungen über die Grundlagen der Philosophie Produced by Norbert H. Langkau, Alexander Bauer and the Online Distributed Proofreading Team at http://www.pgdp.net "Betrachtungen über die Grundlagen der Philosophie" by René Descartes is a philosophical treatise written in the 17th century. The work explores foundational questions about existence, knowledge, and the nature of reality, focusing on the role of doubt and reason in achieving certainty. It lays the groundwork for modern philosophy and seeks to establish a systematic approach to understanding the world. The opening portion of the text introduces Descartes' method of radical doubt, where he questions everything he previously believed to be true, particularly the reliability of the senses. He contemplates the existence of a deceptive demon that could manipulate his perceptions, ultimately leading him to conclude that the only indubitable truth is his own existence—encapsulated in the famous phrase "Cogito, ergo sum" ("I think, therefore I am"). This section sets the stage for his exploration of the nature of the mind, the relationship between the mind and body, and the existence of God, establishing the philosophical framework that the rest of the treatise will build upon. (This is an automatically generated summary.) Reading ease score: 64.5 (8th & 9th grade). 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