Descartes Explained
“By this point frantic with worry, Descartes seeks to repair some of the damage caused by his relentless doubting by groping around for something — anything — we can be absolutely certain of.”
And, after a while, he finds it. I think, therefore I am“
https://philosophybreak.com/articles/i-think-therefore-i-am-descartes-cogito-ergo-sum-explained/