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EternalHindu12
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Well, since you are not so sure about anyone else's existence, how can you be so sure "I" exists? Descartes' argument is circular reasoning; it assumes "I" exists. As skeptics have noted, instead of saying "I doubt therefore I am," Descartes should have said that "thinking is occurring." If everything is simply blunt physical matter swirling around, then "I" is an illusion. This is naturally where atheism should lead us. Sam Harris sums up the non-existence of the self well here:
Since the conclusion was included in the premise, you entered an infinite loop, a circular argument.
"Sum, ergo cogito: cogito, ergo sum."
-Nietzsche
Fair enough.. but in this case that's what makes the argument. If you doubt that you are doubting and you doubt that and that ad infinitum, this is what proves to me that I exist.