JoeDawg
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Ironside said:What I'm trying to say is, if someone might be illusional ( like you are suggesting) then how do I know you're not fake and how do you know I'm not fake. Doesn't add up. If a living thing is illusional, then so is nature, the Earth and pretty much the whole universe.
That is the exact idea. Descartes used that assumption, that he as being decieved, not to figure out a theology, but to figure out if there was anything that could be known 'for certain'. Not evidence, not probable or likely, but certain.
Sure we have lots of evidence and indicators that things are this way or that, but he wanted to know what if anything he could be certain of. This way, he could use that as a foundation and avoid making errors. Its a high standard, but when one is talking about first principles they have to be high.