A Non-Circular Argument for the Existence of the Self

I may not exist. My world may not exist, and this non-existing world may be experienced through the context of this non-existing self.

I wanna play. Auraist recently wrote:

Do you know a valid (non-circular) justification for the existence of the self? In other words, can you prove that you exist? If so, send that proof in reply to this email and if it is indeed non-circular we’ll publish it, inform the world’s philosophers and major media, and send you a complimentary lifetime paid sub…