Part IV
The famous declaration 'I think, therefore I am' (je pense, donc je suis) is presented as the first principle of philosophy that resists hyperbolic doubt.
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From Discourse on the Method by René Descartes
Descartes' foundational discovery that the act of doubting proves the existence of the doubter, establishing the first indubitable principle of his philosophy.
Part IV
Descartes infers from the cogito that he is 'a substance whose whole essence or nature is only to think,' distinct from the body.
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