In one work, the creator of this idea said that it could not be directly extended to seeing and walking.
In one work, the creator of this idea said that it could not be directly extended to seeing and walking. In another work, the description of this idea is followed by the author discussing perfections he knows he does not have but that must be held by someone. This phrase was called the most certain thing to occur to someone who philosophizes in an orderly fashion in a list appearing in its creator's Principles of Philosophy. This phrase was considered the first principle by its creator after he arrived at it by using his system of methodic doubt. This phrase was originally written in French when it appeared in the Discourse on Method. For 10 points, give this phrase that served as the most basic assumption of Rene Descartes.
In one work, the creator of this idea said that it could not be directly extended to seeing and walking.
I think, therefore I am [accept alternate phrasings; or cogito, ergo sum; or je pense, donc je suis]