After a painful search,Descartes concluded that the only thing of which he could be certain was:

Question

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Descartes' famous statement "Cogito, ergo sum" (I think, therefore I am) reflects his conclusion that the only thing of which he could be certain was the fact that he doubted, and that his doubting implied that there must be a thinking entity (the self) that exists. This became the foundation of his philosophical quest for knowledge and truth.

After a Painful Search,Descartes Concluded That the Only Thing of Which