This phrase was reversed in Miguel de Unamuno (OO-nah-MOO-know
This phrase was reversed in Miguel de Unamuno (OO-nah-MOO-know)'s The Tragic Sense of Life. It was originally presented as an argument against the possibility of a demon that sends false sense data. It first appeared in 1637's (*) Discourse on Method, where it was presented as the only assertion that can stand up to methodical doubting, because a mind must exist in order to doubt. For 10 points, give this phrase which formed the basis of Rene Descartes's (day-CARTZ) philosophy.
This phrase was reversed in Miguel de Unamuno (OO-nah-MOO-know
"{Cogito ergo sum}" [or "I {think}, {therefore} I {am}"; or "{Je pense donc je suis}"]