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Latin: Cogito ergo sum (French: J"e pense donc je suis"; English: "I think, therefore I am"), is a philosophical statement used by René Descartes, which became a fundamental element of Western philosophy.

Descartes's original statement was "Je pense donc je suis," from his Discourse on Method (1637). He wrote it in French, not in Latin and thereby reached a wider audience in his country than that of scholars. He uses the Latin "Cogito ergo sum" in the later Principles of Philosophy (1644). At that time, the argument had become popularly known in the English speaking world as 'the "Cogito Ergo Sum" argument', which is usually shortened to "Cogito" when referring to the principle virtually everywhere else. Read more on Wikipedia...