... 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. The argument is well-known in English as "the cogito". This proposition doubts the existence of the world. As Descartes' Mediation explains: I ... proposition, there are a few points that need to be clarified. First of all, "Cogito ergo sum" has to be in first-person. On the other hand, if the sentence is written in third-person, such as "Tony thinks", the cogito will not be true. Writing in ... never been used ...

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• Grade Level: High School