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For Descartes, this was the fact that he existed as a thinker. He was perfectly sure he was thinking; and he was likewise convinced that to be thinking he had to exist as some kind of substance.

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Q: What thing was impossible for Descartes to doubt?
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What one thing was impossible for Descartes to doubt?

Descartes found it impossible to doubt his own existence. The reason for this was that he felt that thoughts had to come from himself.


What is the one thing Descartes cannot doubt?

Descartes cannot doubt his own existence, as captured in his famous statement "Cogito, ergo sum" - "I think, therefore I am."


What is the first truth of which Descartes is certain?

"I think, therefore I am" is the first truth of which Descartes is certain. This statement, known as cogito ergo sum, demonstrates Descartes' method of doubt by acknowledging that even if all his perceptions are false, his ability to doubt and think proves his existence as a thinking being.


Why did Ren Descartes embark on the project of doubt?

Short answer: Descartes' doubt was like WWI - the doubt to end all doubt. Only by doubting everything could Descartes hope to find anything that was certain (even if the only certainty is that nothing else is certain!).


What was the method employed by Descartes in order to find an absolute starting point for building up your knowledge?

Systematic doubt. Descartes could doubt everything except for one thing - his own existence. Cogito ergo sum - "I think, therefore I am" - became his first principle.


What and how does descartes atempt to doubt?

Descartes attempts to doubt everything he believes to be true in order to find a foundational belief that cannot be doubted. He starts by doubting his senses, then his perceptions, and finally even the existence of the external world. Through this method of doubt, he arrives at the conclusion that his own existence as a thinking thing ("I think, therefore I am") is indubitable.


What does Descartes argue that he cannot doubt in Meditation 2?

He can not doubt that he thinks, therefore he exists.


What role does doubt play in descartes meditation?

In Descartes' Meditations, doubt serves as a tool for philosophical inquiry by challenging and ultimately casting skepticism on the reliability of sense perceptions and beliefs. Through methodical doubt, Descartes aims to uncover indubitable truths and establish a foundation of certain knowledge upon which to build his philosophical system. Doubt, therefore, acts as a catalyst for Descartes' quest for certainty and the establishment of foundational principles in his philosophy.


Who created the system of systematic doubt?

René Descartes, a French philosopher, created the system of systematic doubt. In his work "Meditations on First Philosophy," Descartes employs the method of doubt to question all his beliefs in order to find a foundation of certainty in knowledge.


What does Descartes find he cannot doubt?

That he is sentient ie that he thinks.


What is Descartes theory of knowledge?

Descartes' theory of knowledge was to doubt all things and accept as knowledge the things that could not be doubted


What is the aim or purpose of Descartes Meditations?

Descartes hopes to find out what he can know for certain, without any doubt, about the world and nature.