He is perhaps best known for the philosophical statement "Cogito ergo sum" (French: Je pense, donc je suis; I think, therefore I am), found in part IV of Discourse on the Method (1637 – written in French but with inclusion of "Cogito ergo sum") and §7 of part I of Principles of Philosophy (1644 – written in Latin).
Contents
A Discourse of a Method for the Well Guiding of Reason
Selections from the Principles of Philosophy
A Discourse on Method
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