it followed very evidently and very certainly that I existed. On the other hand, if I had ceased to think while all the rest of what I had ever imagined remained true, I would have had no reason to believe that I existed
Despite its highly speculative dimension, this fragment is arguing in favor of materialism. Thought, even doubtful, is the symptom of the existence of the thinking being and the absence of thought would be the symptom of the absence of existence of the thinking being (this reasoning is not applicable to non thinking beings without reintroducing Idealism). The perpetuated objective truth of what I thought about after the extinction of my own thought confirms my disappearance or my “non existence” as a being. Even if I do not produce thoughts about my children after my death, their life will continue.