Abstract

Basic Cartesian intuitions are directed at simple natures, not truths; but intuitions are also a foundation for propositional knowledge. There are two basic objectives of this chapter: to show how Descartes gets from intuitions to propositional knowledge, and to show how his solution to this problem structures his thinking on the main issues in Cartesian epistemology. I maintain that the solution to is to be found in the principle if we perceive the presence of an attribute A, there must be an actually existing substance to which A is attributed. This principle gets its clearest expression in the Principles of Philosophy but also appears in the Rules for the Direction of the Mind and in the Meditations where, I argue, it appears in the form of the Rule of Truth. I show how this principle is derived from the cogito, understood both as inference and as intuition, how this principle plays a role in Descartes theory of consciousness and self‐knowledge, in the case for substance dualism, and in the theory of clear and distinct ideas.