That he is a thinking thing that exists.
Descartes suggested the method of universal doubt as a way to arrive at certain knowledge. He proposed doubting everything that could be doubted in order to find a foundation of truth that is indubitable. This led him to his famous conclusion: "I think, therefore I am."
Descartes famously stated, "Cogito, ergo sum" or "I think, therefore I am." This means that the one truth he can be sure of is his own existence as a thinking being, because the act of doubting or thinking proves that he must exist in some form.
Descartes believed that God is a necessary being who exists as a perfect and infinite being. He argued that the existence of God is essential for the guarantee of our clear and distinct perceptions, as well as for the coherence of the universe. Descartes also posited that God is the guarantor of truth and the source of all reality.
Descartes believed that the senses are not to be trusted because they can sometimes deceive us. He argued that illusions, dreams, and other sensory experiences can lead us to false perceptions of reality. Since our senses can be unreliable, Descartes advocated for relying on reason and intellect to arrive at truth.
Descartes believed that doubt was a crucial tool in the search for truth. By subjecting all his beliefs to doubt, he aimed to find a foundation of knowledge that could not be doubted. This led him to his famous statement "Cogito, ergo sum" (I think, therefore I am), which served as the starting point for his philosophical system.
Descartes believed that the truth must be indubitable because doubting leads to answers. The only thing he perceived to be certain was his own existence.
Philosophically, Descartes was concerned with the existence of reality.
Descartes and Bacon both advocated for skepticism and looking for the truth in a rational fashion. They both had methods of finding the truth in a logically ordered fashion that incorporated reasonable doubt.
That he existed.
Descartes suggested the method of universal doubt as a way to arrive at certain knowledge. He proposed doubting everything that could be doubted in order to find a foundation of truth that is indubitable. This led him to his famous conclusion: "I think, therefore I am."
Descartes
i am i exist
Descartes hopes to find out what he can know for certain, without any doubt, about the world and nature.
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!).
Father Of Modern Philosophy.
Rene Descartes was the first to do anything really interesting with them. The Latin form of Descartes is Cartesius and the familiar X-Y coodinates are known as Cartesian coordiates after Descartes.
Descartes famously stated, "Cogito, ergo sum" or "I think, therefore I am." This means that the one truth he can be sure of is his own existence as a thinking being, because the act of doubting or thinking proves that he must exist in some form.