This book provides a radical alternative to naturalistic theories of content, and offers a new conception of the place of mind in the world. Confronting the scientific conception of the nature of reality that has dominated the Anglo-American philosophical tradition, Morris presents a detailed analysis of content and propositional attitudes based on the idea that truth is a value. He rejects the causal theory of the explanation of behavior and replaces it with an alternative that depends upon a rich conception of the behavior we explain with references to state of mind. His lucid and detailed exposition of this controversial arguments poses an emphatic challenge to the naturalistic orthodoxy in areas as diverse as metaphysics, ethics, and cognitive science.