Descartes failed to apply his standard of truth to itself.

Question

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Descartes' standard of truth, the method of doubt, was not applied to the proposition that the method of doubt is itself a true and reliable method. This oversight is known as the "Cartesian Circle." Descartes established his standard of truth as being clear and distinct ideas, but he did not subject this standard to scrutiny to see if it met its own criteria. Therefore, he failed to apply his standard of truth to itself.

Descartes Failed to Apply His Standard of Truth to Itself