A common criticism of Descartes's approach is that he failed to apply his standard of truth to itself.

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Descartes's method of doubt involves questioning the truth of all beliefs in search of something absolutely certain. Critics argue that he did not adequately apply this skeptical standard to the foundational principle of his philosophy, the cogito ("I think, therefore I am"), potentially making his method self-refuting.

A Common Criticism of Descartes's Approach Is That He Failed