A Journey On Knowledge... Or the Lack of It

There is nothing that I know of certainly, except perhaps that I am conscious, and this even, I got from Descartes and not derived from my own thinking. But that even, is limited. Yes, I am a conscious being, a thinker. I do not know though, for certain, if I even truly have a physical body, and so I proclaim that there are many things I do not know.