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The Cogito is valid in virtue of the principle that whatever is absolutely clear and distinct as an idea is certain.

What do you think of this?

My thought:

It appears to reassemble in a flash pretty well everything that had been destroyed by the Evil Demon. That is, Descartes invited us to consider that even our strongest certainties could have been put in us by an all-powerful God-like being, for example elementary mathematical 'certainties' like 2+2=4. But here he is apparently saying after all that if we really are absolutely clear about the something (eg that I am thinking and therefore exist) not even the Evil Demon can be thought of as possibly bringing that about.

 

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