 Finally, Descartes’ reference to an “I”, in the “I think,” is not intended to presuppose the existence of a substantial self. In the very next sentence following the initial statement of the cogito, the meditator says: “But I do not yet have a sufficient understanding of what this ‘I’ is, that now necessarily exists” (AT 7:25, CSM 2:17). As Stephen Menn writes: