Early in the Second Meditation Descartes has found grounds to doubt his previous opinions, and following his resolve to reject as false anything not entirely indubitable, he rejects these opinions. He then asks whether there might remain something impervious to doubt that he has not yet considered. One item as yet unconsidered is his own existence:
I myself, am I not at least something? But I have already denied that I had senses and body. Yet I hesitate, for what follows from that? Am I so dependent on body and senses that I cannot exist without these? But I was persuaded that there was nothing in all the world, that there was no heaven, no earth, that there were no minds, nor any bodies: was I not then likewise persuaded that I did not exist? (HR I, 150)