It is to the body alone that we should attribute everything that can be observed in us to oppose our reason.
Rene DescartesI was convinced that our beliefs are based much more on custom and example than on any certain knowledge.
Rene DescartesOn 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.
Rene Descartes