‘How do I know that any person is conscious?’

‘ How do I know that I was conscious before the present moment?’

– radical skeptic

Since the radical skeptic excludes, in principle, any empirical controls to allay his doubt, he overplays his hand.

It is impossible to doubt everything, for that entails doubting the meaning of the very words used to express radical doubt (reductio ad absurdum).

 

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