The Evil Demon
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State
Descartes' evil demon: imagine a deceiver powerful enough to fabricate your every experience—even mathematics could then be doubted.
Show
The sky, this page, two plus three: all could be the demon's stagecraft, fed to a disembodied mind.
Watch for
The demon is a doubt-maximizer, not a theology. Descartes builds the strongest opponent he can, on purpose.