The Bedrock of Modern Philosophy
The Cogito is perhaps the most famous phrase in the history of Western philosophy. First written in French as Je pense, donc je suis in his 1637 work Discourse on the Method, Descartes later formulated it in Latin as Cogito, ergo sum. The proposition represents the exact moment where Descartes' radical skepticism hits rock bottom and reverses course, establishing the first undeniable truth of his philosophical system.
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Join NowAn Intuition, Not a Syllogism
It is important to note that the Cogito is not a formal logical deduction (a syllogism) like "All humans are mortal; I am human; therefore, I am mortal." If it were a syllogism, it would rely on the premise "Whatever thinks, exists," which would itself be subject to Cartesian doubt. Instead, Descartes conceived the Cogito as an immediate, self-evident intuition. The moment you consciously think, doubt, or even wonder if you exist, you directly experience your own existence. The act of thinking and the existence of the thinker are realized simultaneously as a single, indubitable truth.