I think therefore I am

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English[edit]

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Etymology[edit]

First expressed in French by René Descartes, a 17th century French philosopher, as je pense donc je suis.

Phrase[edit]

I think therefore I am

  1. (philosophy) I am able to think, therefore I exist. A philosophical proof of existence based on the fact that someone capable of any form of thought necessarily exists.

Usage notes[edit]

  • Subject to many humorous variations, such as I drink therefore I am, I speak therefore I am, or I shop therefore I am.

Translations[edit]