I think; therefore I am

Cultural  

1. A statement by the seventeenth-century French philosopher René Descartes. “I think; therefore I am” was the end of the search Descartes conducted for a statement that could not be doubted. He found that he could not doubt that he himself existed, as he was the one doing the doubting in the first place. In Latin (the language in which Descartes wrote), the phrase is “Cogito, ergo sum.”

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Example Sentences

The French Enlightenment philosopher René Descartes famously observed that every self-aware being is able to declare, figuratively if not literally, the Latin statement "Cogito ergo sum" — that is, "I think therefore I am."

From Salon • Dec. 6, 2022

"I'm not your friend or anything / Damn, you think that you're the man / I think, therefore, I am," she sings in the chorus.

From Fox News • Nov. 12, 2020

René Descartes summed this up in his famous phrase: cogito ergo sum – I think, therefore I am.

From The Guardian • Jan. 6, 2018

Could Sir Isaac Newton's revelation about gravity after an apple fell on his head, and Descartes' observation that "I think, therefore I am", be called examples of autoethnography?

From BBC • May 9, 2017

I think, therefore I am a polar bear.

From "The Very, Very Far North" by Dan Bar-el