Originally posted by Soljer
You don't have to believe Descartes for it to be true.The fact that you think means you exist.
That's just giving credit to the guy when it was his philosophies that are discussed.
The most common flaw there is that you have two steps in your argument:
1) You think.
2) You exist.
The bridge between 1) and 2) is syllogistic. Not to mention the act of thinking requires relativising, but the existence of anything besides the first person cannot be proven without a third person perspective, meaning for disbelievers, this particular philosophy uses the subjective content of one's mind to prove the absolute reality of everything else.