A big thing around the time Descartes said that was denying that reality was real. That everything was an illusion, including human existence. Descartes’s famous phrase was him realizing while doubting a part of this that if he was doubting something, he had to be thinking about it, and if he was thinking about it, he had to exist in order to have the thought. No existence, no thought, no doubt. If everything was an illusion, if something was playing a trick on him, he had to exist in order to be tricked.
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