For ten points, name this philosopher who stated "cogito ergo sum" in his Discourse on Method.
One work by this man argues that wax is wax even if it changes in color or shape because it is perceived "by the intellect alone", while another suggests a form of duality in which the mind controls the body, but the body also influences the mind. Another work by this author of (*) Meditations on First Philosophy attempts to create a fundamental set of principles using a method called metaphysical doubt, which led to his conclusion that thought exists. For ten points, name this philosopher who stated "cogito ergo sum" in his Discourse on Method.
One work by this man argues that wax is wax even if it changes in color or shape because it is perceived "by the intellect alone", while another suggests a form of duality in which the mind controls the body, but the body also influences the mind.
René {Descartes}