This is a collection of five essays debating the nature and scope of ancient scepticism, and providing an introduction to the thought of the original sceptics. The book seeks to shed new light on how their thought relates to sceptical arguments in modern philosophy.

The first comprehensive, up-to-date treatment of Greek sceptism, from the beginnings of epistemology with Xenophanes, to the final full development Pyrrhonism as presented in the work of Sextus Empiricus.

Scepticism, a philosophical tradition that casts doubt on our ability to gain knowledge of the world and suggests suspending judgement in the face of uncertainty, has been influential since is beginnings in ancient Greece. Harald Thorsrud provides an engaging, rigorous introduction to the arguments, central themes and general concerns of ancient Scepticism, from its beginnings with Pyrrho of Elis (c.360-c.270 BCE) to the writings of Sextus Empiricus in the second century CE. Thorsrud explores the differences among Sceptics and examines in particular the separation of the Scepticism of Pyrrho from its later form - Academic Scepticism - which arose when its ideas were introduced into Plato's "Academy" in the third century BCE. He also unravels the prolonged controversy that developed between Academic Scepticism and Stoicism, the prevailing dogmatism of the day. Steering an even course through the many differences of scholarly opinion surrounding Scepticism, Thorsrud provides a balanced appraisal of its enduring significance by showing why it remains so philosophically interesting and how ancient interpretations differ from modern ones.

Five Modes of Scepticism examines the argument forms that lie at the heart of Pyrrhonian scepticism as expressed in the writings of Sextus Empiricus. These are the Agrippan modes of disagreement, hypothesis, infinite regression, reciprocity and relativity; modes which are supposed to bring about that quintessentially sceptical mental state of suspended judgement. Stefan Sienkiewicz analyses how the modes are supposed to do this, both individually and collectively, and from two perspectives. On the one hand there is the perspective of the sceptic's dogmatic opponent and on the other there is the perspective of the sceptic himself. Epistemically speaking, the dogmatist and the sceptic are two different creatures with two different viewpoints. The book elucidates the corresponding differences in the argumentative structure of the modes depending on which of these perspectives is adopted. Previous treatments of the modes have interpreted them from a dogmatic perspective; one of the tasks of the present work is to reorient the way in which scholars have traditionally engaged with the modes. Sienkiewicz advocates moving away from the perspective of the sceptic's opponent - the dogmatist - towards the perspective of the sceptic and trying to make sense of how the sceptic can come to suspend judgement on the basis of the Agrippan modes.

What is knowledge? Is it the same as opinion or truth? Do you need to be able to justify a claim in order to count as knowing it? How can we know that the outer world is real and not a dream? Questions like these have existed since ancient times, and the branch of philosophy dedicated to answering them - epistemology - has been active for thousands of years. In this thought-provoking Very Short Introduction, Jennifer Nagel considers the central problems and paradoxes in the theory of knowledge and draws attention to the ways in which philosophers and theorists have responded to them. By exploring the relationship between knowledge and truth, and considering the problem of scepticism, Nagel introduces a series of influential historical and contemporary theories of knowledge, incorporating methods from logic, linguistics, and psychology, using a number of everyday examples to demonstrate the key issues and debates. ABOUT THE SERIES: The Very Short Introductions series from Oxford University Press contains hundreds of titles in almost every subject area. These pocket-sized books are the perfect way to get ahead in a new subject quickly. Our expert authors combine facts, analysis, perspective, new ideas, and enthusiasm to make interesting and challenging topics highly readable.

This volume offers a comprehensive survey of the main periods, schools, and individual proponents of scepticism in the ancient Greek and Roman world. The contributors examine the major developments chronologically and historically, ranging from the early antecedents of scepticism to the Pyrrhonist tradition. They address the central philosophical and interpretive problems surrounding the sceptics' ideas on subjects including belief, action, and ethics. Finally, they explore the effects which these forms of scepticism had beyond the ancient period, and the ways in which ancient scepticism differs from scepticism as it has been understood since Descartes. The volume will serve as an accessible and wide-ranging introduction to the subject for non-specialists, while also offering considerable depth and detail for more advanced readers.

Outlines of Scepticism, by the Greek philosopher Sextus Empiricus, is a work of major importance for the history of Greek philosophy. It is the fullest extant account of ancient scepticism, and it is also one of our most copious sources of information about the other Hellenistic philosophies. Its first part contains an elaborate exposition of the Pyrrhonian variety of scepticism; its second and third parts are critical and destructive, arguing against 'dogmatism' in logic, epistemology, science and ethics - an approach that revolutionized the study of philosophy when Sextus' works were rediscovered and published in the sixteenth century. This volume presents the accurate and readable translation which was first published in 1994, together with a substantial new historical and philosophical introduction by Jonathan Barnes.