Philosophy

Hello. Please help me write from 5-6 sentences regarding René Descartes 1 &2 Meditations. Suggested question/topic: “And so from this point on, I must be careful lest I unwittingly mistake something else for myself.” Why does Descartes say that? How does this fit in the theme of our class, ‘The self, the other, and the world?’ What is this thing that I call myself? 

https://www.earlymoderntexts.com/assets/pdfs/descartes1641.pdf 

material website.