The concept of the "evil demon" is most famously associated with the philosopher René Descartes, particularly in his work "Meditations on First Philosophy." In this context, the evil demon is a hypothetical being that is capable of deceiving an individual to the extent that it causes them to doubt the existence of the external world and even their own thoughts and perceptions. Descartes introduced the evil demon to explore skepticism and the extent to which knowledge can be certain.
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