One of this thinker's pro
One of this thinker's proofs of God's existence relies on three categories of ideas: Innate, Factitious, and Adventitious. He reworked Plato's Great Chain of Being to explain how an imperfect man could descend from God.  Gilbert Ryle's The Concept of Mind calls this man's mind-body dualism "the ghost in the machine." This thinker claimed that all knowledge could be the result of an "evil demon." For 10 points, name this author of Meditations on First Philosophy, whose Discourse on Method contains his phrase cogito ergo sum, or "I think, therefore I am."
One of this thinker's proofs of God's existence relies on three categories of ideas:
Réne Descartes [or Renatus Cartesius]