"Cogito ergo sum", translates to "I think, therefore I am" in English, is a famous quote written by René Descartes. 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. The argument is well-known in English as "the cogito". This proposition doubts the existence of the world. As Descartes' Mediation explains: .
I have convinced myself that there is absolutely nothing in the world, no sky, no earth, no minds, no bodies. Does it now follow that I too do not exist? No: if I convinced myself of something then I certainly existed. But there is a deceiver of supreme power and cunning who is deliberately and constantly deceiving me. In that case I too undoubtedly exist, if he is deceiving me; and let him deceive me as much as he can, he will never bring it about that I am nothing so long as I think that I am something. So after considering everything very thoroughly, I must finally conclude that this proposition, I am, I exist, is necessarily true whenever it is put forward by me or conceived in my mind. (Mediation. 2, Oeuvres de Descartes 7:25).
Descartes explains his proposition very well in the quote above. However, "Cogito ergo sum" raises a lot of questions over the course of thousands of years, different people have different understandings of the cogito. Here raises the question: What is the right interpretation of "Cogito ergo sum"? Therefore, in order to truly understand this 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 third-person has already proved the existence of first-person, therefore, the third-person's existence is questionable.