Rene Descartes, in his first meditation, tells us that everything in this world is dubious and that we cannot rely on our senses/perceptions. ... In meditation two, Descartes gives us his proof of one sure thing, he exists as a doubter, a thinker, a mind. ... In meditation three Descartes attempts to prove the existence of God. ... And finally Descartes attempts to prove the existence of material substances in meditation six. ... (Marx Philosophy 121)...

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