 The extraordinary certainty and doubt-resistance of the cogito marks an Archimedean turning point in the meditator’s inquiry. However, there are interpretive disputes about whether Descartes intends the cogito to count – at its initial introduction, prior to the arguments for God – as fully indubitable, and therefore as perfect knowledge. It is quite common to interpret the cogito as being the first item of perfect knowledge. In  Section 6.1  we’ll explore how such interpretations (i.e., Bounded Doubt Interpretations) render Descartes broader argument. But here, I want to develop the textual case for holding that even the cogito is undermined by Evil Genius Doubt.