Certainty: Psychological, Moral, and Metaphysical

Abstract

This chapter examines Peter Markie's book, “Descartes Gambit,” Edwin Curley's work titled “Descartes Against the Skeptics” and the exchange of criticisms between the two works. The “gambit” Markie refers to in his title is Descartes' attempt to deduce a metaphysical theory of the self from premises about his knowledge of himself. The epistemological premises are that “I am certain that I think”, that “I am certain that I exist”, and that “I am uncertain that I have a body.” The metaphysical theory of the self derived from these premises is, roughly, that I am a thinking, nonextended substance capable of existing apart from its body. Markie maintains that Descartes himself held that these metaphysical conclusions could be deduced from these epistemological premises without establishing God's existence and veracity. The point of contention between the two works is on the definition and relationship of three species of Cartesian certainty— psychological, moral, and metaphysical.