PHILOS 1 Lecture Notes - Lecture 3: Evil Demon, David Hume, Cartesian Doubt
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To doubt everything that can be doubted, descartes starts with beliefs derived from sensory experience. Our senses sometimes doubt us, like when we"re dreaming the dream argument: If there"s no way to determine if we"re dreaming or awake, then there"s the possibility that we are constantly dreaming. Our whole lives may just be a dream. However, the things we dream of must have been something we encountered while awake. Even imagined things, such as mythical creatures, are extensions of real colors and shapes. But if all that were to be a dream, then at least mathematical truths cannot be imagined (4+4=8, awake or dreaming) And if there is no god, then the likelihood of deception is even greater. Conclusion: everything must be doubted the evil demon argument: Descartes struggled not to fall back on previous beliefs, so he imagines that an evil demon is doing everything it can to completely deceive him.
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