The phrase “I think, therefore I am” was said by the French philosopher René Descartes.

Quick Scoop

  • The original phrase is in Latin: “Cogito, ergo sum.”
  • Descartes first published it in 1637 in his work Discourse on the Method.
  • It expresses his idea that the very act of thinking proves the existence of the thinker : if you are doubting or thinking, you must exist in order to do that.

In short: René Descartes coined “I think, therefore I am” as a foundation for certain knowledge in philosophy.

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