René Descartes Quote
On the one hand I have a clear and distinct idea of myself, in so far as I am a thinking, non-extended thing; and on the other hand I have a distinct idea of body, in so far a this is
simply an extended, non-thinking thing. And, accordingly, it is certain that I am really distinct from my body, and exist without it.
Discourse on Method and Meditations on First Philosophy (ed. Hackett Publishing, 1999) - ISBN: 9781603844482