Descartes & Doubt

Descartes and Doubt

Descartes wanted knowledge as solid as mathematics, so he tried doubting everything (his senses, the world, even his own body) to see what could survive. Perhaps a deceiver fooled him at every turn. Yet one thing held firm: to be deceived, he must exist to be deceived. In the very act of thinking, he found his first certainty.

“I think, therefore I am.”

Where this sits in the course

“Descartes & Doubt” is lesson 1 of 3 in Reason Awakens, a course about modern philosophy begins by rebuilding knowledge and duty.. The lessons are sequenced rather than a menu, so this one assumes what came before it.

Reason Awakens is itself one of 18 courses in thinkr. The set opens with what philosophy is, moves through the Stoics and the Eastern traditions, then into what can be known, what exists, how to act and how power works — closing on practical reasoning you can use in an argument this week.

In the app this lesson is followed by 4 exercises that check whether the idea actually landed — and every answer, right or wrong, is explained rather than scored. That is the part a written page cannot reproduce.