“It must, in fine, be maintained, all things being maturely and carefully considered, that this proposition (pronunciatum) I am, I exist, is necessarily true each time it is expressed by me, or conceived in my mind.”
René Descartes, Meditations on First Philosophy, Meditation II §3 (trans. John Veitch, 1853/1901), public domain.public domain
I Am, I Exist
RationalityArgument · power 82 · 100% accurateIn the gameIn the Meditations, Descartes is careful not to make this an argument with a therefore. Even if he is deceived about everything, a thing that is deceived must exist. That much survives every doubt.