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Descartes Doubt

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Descartes defines knowledge as doubt and uncertainty. He describes that our main source of knowledge is our sense perception. Since sense perception is often mistaken, that’s what makes it uncertain. The perception we have can only be doubted since it could all just be a dream or hallucination. To have certainty we must doubt all beliefs. Descartes describes in his 1640 letter to Regius that some source of reason might lead us to doubt, but knowledge is based on reason and it is so strong it can never be overpowered by any stronger reason. He views that if we increase our certainty, our doubt decreases. The requirement of knowledge is based on certain complete absences of doubt. Descartes presents his metaphysics in two meditations. Descartes
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