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Quotation from Discourse on Method by Rene Descartes

“I think, therefore I am (COGITO ERGO SUM”

Rene Descartes (spoken by Descartes)

Discourse on Method, Part IV, trans. John Veitch (19th century)

Portrait of Rene Descartes

The first certainty that survives Descartes's universal doubt, including doubt that waking life differs from dreams.

Citation: "I think, therefore I am (COGITO ERGO SUM" — Rene Descartes, Discourse on Method, Part IV, trans. John Veitch (19th century). (id discourse-on-method-q7)

Portrait: Portrait of the French philosopher and mathematician René Descartes (1596-1650), After Frans Hals, Public domain.

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Quote card: I think, therefore I am (COGITO ERGO SUM