It is a commonplace to say that in antiquity philosophy was conceived as a way of life or an art of living, but precisely what such claims amount to has remained unclear. If ancient philosophers did think that philosophy should transform an individual's way of life, then what conception of philosophy stands behind this claim? John Sellars explores this question via a detailed account of ancient Stoic ideas about the nature and function of philosophy. He considers the Socratic background to Stoic thinking about philosophy and Sceptical objections raised by Sextus Empiricus, and offers...