This book consists of Gregory Vlastos' studies on a variety of themes in Plato's metaphysics, epistemology, ethics, and social philosophy. Although many of the essays have appeared in various philosophical and classical journals or symposia, new in the volume are two major studies. One is on Plato's theory of love, exploring its metaphysical dimension and its far-reaching implications for personal and political relations. The other centers on semantic and logical problems in the Sophist. It offers solutions to crucial difficulties in this fundamental Platonic work. In these essays the author presents ideas which are likely to provoke comment and may be discussed as vigorously in scholarly journals as has some of his earlier work. The other papers, some of them extensively revised, comprise virtually all the author's published work on Plato, with the exception of a few papers easily accessible elsewhere. This second edition includes three additional essays and extensive notes that were not included in the original edition.