This proposition is a fundamental element in Western philosophy, as it is presupposed by all knowledge. Descartes' original phrase, je pense, donc je suis, which is first written in his Discourse on the Method. ... First of all, "Cogito ergo sum" has to be in first-person. ... According to Descartes's meditation, "I have convinced myself that there is absolutely nothing in the world, no sky, no earth, no minds, no bodies." (Meditation. 2, Oeuvres de Descartes 7:25) If I am not certain of the existence of my legs, then I can prove that I exist using this propos...

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