Abstract

In this thesis I offer a reconstruction of some of the foundations of Plato's Theory of Knowledge. This effort is based upon two Platonic theses: Thought is Language and The objects of different faculties of the soul are distinct. The thesis is an investigation of the inter-relation of these two claims. I argue that the former does not prompt Plato to abandon the latter, the so-called Two Worlds hypothesis of the Republic, but rather serves as a justification of that hypothesis. In the first chapter I discuss Plato's philosophy of language. The vehicle for this is the Cratylus. Through a careful reading of the entire dialogue I present a new interpretation of the three naming-relations of the work, namely Natural Names, Conventional Like Names and Conventional Unlike Names. One element of this view is that the Cratylus' theory of names is in accord with the remarks of the Phaedo about the different ways in which Forms and participants bear the same name. ;The concern of the second chapter is Plato's Ontology. Although my focus is on the nature of the various beings that serve as the objects of the psychological attitudes, the aim of the chapter is to show how the three kinds of names discovered in the Cratylus can be mapped onto the three kinds of beings of Plato's Ontology, Forms, form-copies and material particulars such as Socrates. This results in a new interpretation of the relation between a Form and its essence, a new way to look at the Aristotelian Third Man argument and a new understanding of the separation of the Forms. I base my argument on the Phaedo, Republic and especially Parmenides. ;In chapter three I turn to the nature of the soul as thinker. In the first half of the chapter I concentrate on Plato's Theory of Aisthesis. I argue that it is not a faculty of the same part of the soul as knowledge and belief. In the second section I show how Plato's conception of the soul and his Ontology combine to allow language to serve as the vehicle for all the activities of the rational soul without violating the two worlds hypothesis. In the conclusion I offer a myth of the language-learner to bring out the interrelation of Psychology, Ontology and Language. The myth illustrates the various stages in the development of mind, shows how most of humankind comes to the stage of belief and suggests why they do not progress beyond belief to knowledge