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Species of speciousness 5: conceivability and possibility

By Tom Chatfield  

If we can think it, does that make it possible, or even true? Descartes argued something like this in part four of his seminal Discourse on the Method of Rightly Conducting the Reason, and Seeking Truth in the Sciences. Having laid the foundations of modern philosophy with the declaration that his own thinking was a matter of certainty in an otherwise radically uncertain world, he went on to argue that, since he had within his thinking an idea of perfection, there must be such a thing as a perfect being who gave him this idea—

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