The evil demon argument provides possible doubt ruling out that external bodies exist and that what he suspected to be true mathematics and geometry as false. ... He asserts, "God would not let me be deceived" about bodies or mathematics and geometry since God is supremely good. ... Descartes confirms that he could be deceived about his senses, mathematics and geometry and extended bodies. ... Ultimately, I claim that Descartes' proof for the existence of God is unsuccessful and that he does not establish God's existence as something he knows clearly and distinctly. ...

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