Descartes establishes with certainty that corporeal things exist and that he has a body.

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Descartes famously concludes "I think, therefore I am" (Cogito, ergo sum), establishing with certainty the existence of the self as a thinking entity, but he does not establish with the same level of certainty the existence of corporeal things or that he has a body. His method involves doubting everything that can possibly be doubted, and while he concludes that his mind exists because it thinks, the existence of the physical world, including his body, is not established with the same level of indubitability.

Descartes Establishes with Certainty That Corporeal Things Exist and That