The Modes of Scepticism is one of the most important and influential of all ancient philosophical texts. The texts made an enormous impact on Western thought when they were rediscovered in the 16th century and they have shaped the whole future course of Western philosophy. Despite their importance, the Modes have been little discussed in recent times. This book translates the texts and supplies them with a discursive commentary, concentrating on philosophical issues but also including historical material. The book will (...) be of interest to professional scholars and philosophers but its clear and non-technical style makes it intelligible to beginners and the interested layman. (shrink)

Justification, or at least ‘justification’, bulks large in recent epistemology. The view that knowledge consists of true-justified-belief has been prominent in this century, and the justification of belief has attracted considerable attention in its own right. But it is usually not at all clear just what an epistemologist means by ‘justified’, just what concept the term is used to express. An enormous amount of energy has gone into the attempt to specify conditions under which beliefs of one or another sort (...) are justified; but relatively little has been done to explain what it is for a belief to be justified, what that is for which conditions are being sought. The most common procedure has been to proceed on the basis of a number of obvious cases of justified belief, without pausing to determine what property it is of which these cases are instances. Now even if there were some single determinate concept that all these theoriests have implicitly in mind, this procedure would be less than wholly satisfactory. For in the absence of an explicit account of the concept being applied, we lack the most fundamental basis for deciding between supposed intuitions and for evaluating proposed conditions of justification. And in any event, as philosophers we do not seek merely to speak the truth, but also to gain an explicit, reflective understanding of the matters with which we deal. We want to know not only when our beliefs are justified, but also what it is to enjoy that status. True, not every fundamental concept can be explicated, but we shall find that much can be done with this one. (shrink)

In his Pyrrhonian Outlines , Sextus Empiricus employs an argument based upon the possibility of disagreement in order to show that one should not assent to a Dogmatic claim to which at present one cannot oppose a rival claim. The use of this argument seems to be at variance with the Pyrrhonian stance, both because it does not seem to accord with the definition of Skepticism and because the argument appears to entail that the search for truth is doomed to (...) failure. In the present paper, I examine the passages in which Sextus utilizes the argument from possible disagreement and offer an interpretation that makes the use of this argument compatible with the Pyrrhonian outlook. (shrink)

In ”Skepticism,” Peter Klein distinguishes between the “Academic Skeptic” who proposes that we cannot have knowledge of a certain set of propositions and the “Pyrrhonian Skeptic” who refrains from opining about whether we can have knowledge. Klein argues that Academic Skepticism is plausibly supported by a “Closure Principle‐style” argument based on the claim that if x entails y and S has justification for x, then S has justification for y. He turns to contextualism to see if it can contribute to (...) the discussion between one who claims that we can have knowledge about some epistemically interesting class of propositions and the Academic Skeptic. He outlines the background of Pyrrhonian Skepticism, pointing out that the Pyrrhonist withholds assent concerning our knowledge‐bearing status because reason cannot provide an adequate basis for assent. He assesses three possible patterns of reasoning, and concludes that the Pyrrhonist view, that reason cannot resolve matters concerning the nonevident, is vindicated. (shrink)

How much should your confidence in your beliefs be shaken when you learn that others – perhaps 'epistemic peers' who seem as well-qualified as you are – hold beliefs contrary to yours? This article describes motivations that push different philosophers towards opposite answers to this question. It identifies a key theoretical principle that divides current writers on the epistemology of disagreement. It then examines arguments bearing on that principle, and on the wider issue. It ends by describing some outstanding questions (...) that thinking about this issue raises. (shrink)

Dialectical foundationalists, including Adler, Brandom, Leite, and Williams, claim that some asserted propositions do not require defense just because an interlocutor challenges them. By asserting such a proposition, the speaker shifts the burden of proof to her interlocutor. Dialectical egalitarians claim that all asserted propositions require defense when challenged. I elucidate the dispute between dialectical foundationalists and egalitarians, and I defend a broadly egalitarian stance against several prominent objections.

Guided by an account of the norms governing justificatory conversations, I propose that person-level epistemic justification is a matter of possessing a certain ability: the ability to provide objectively good reasons for one's belief by drawing upon considerations which one responsibly and correctly takes there to be no reason to doubt. On this view, justification requires responsible belief and is also objectively truth-conducive. The foundationalist doctrine of immediately justified beliefs is rejected, but so too is the thought that coherence in (...) one's total belief system is sufficient, or indeed necessary, for justification. The problem of the regress is solved by exploiting the 'localist' idea that in order to possess the ability to justify any given belief, one only needs to be in a position to draw upon appropriate justified background beliefs to provide good reasons for holding the belief; one needn't be able to defend the relevant background beliefs, and so on, all at one sitting. (shrink)

A study of Pyrrhonean scepticism, consisting of a new translation of Sextus Empiricus' Outlines of Pyrrhonism, accompanied by an analytic introduction and an in-depth, section-by-section commentary - the first of its kind available.

In this paper I will be setting aside contextualists and closure-deniers and focusing solely on neo-Moorean versions of externalist responses to skepticism. I will be focusing on two prominent theses about externalist responses to skepticism, one positive and one negative. The positive thesis announces an alleged virtue of externalism: that externalism alone avoids skepticism. The negative thesis identifies an alleged defect of externalism: that externalism implausibly avoids skepticism. I will be critical of both theses, though I will try to uncover (...) the truth in the neighborhood of each. I’ll close by arguing briefly that the conclusions reached in examining these two theses give us a reason to endorse externalism. (shrink)

In the works of Sextus Empiricus, scepticism is presented in its most elaborate and challenging form. This book investigates - both from an exegetical and from a philosophical point of view - the chief argumentative forms which ancient scepticism developed. Thus the particular focus is on the Agrippan aspect of Sextus' Pyrrhonism. Barnes gives a lucid explanation and analysis of these arguments, both individually and as constituent parts of a sceptical system. For, taken together, these forms amount to a formidable (...) and systematic challenge to any claim to knowledge or rational belief. The challenge had a great influence on the history of philosophy. And it has never been met. This study reflects the growing interest in ancient scepticism. Quotations from the ancient sources are all translated and Greek terms are explained. Notes on the ancient authors give a brief guide to the sources, both familiar and unfamiliar. (shrink)

Sextus Empiricus' Against the Logicians is by far the most detailed surviving examination by any ancient Greek sceptic of the areas of epistemology and logic. It critically examines the pretensions of non-sceptical philosophers to have discovered methods for determining the truth, either through direct observation or by inference from the observed to the unobserved. It is therefore a fine example of the Pyrrhonist sceptical method at work. It also provides a mine of information about the ideas of other Greek thinkers, (...) ideas that are in many cases poorly preserved in other sources. This volume presents Against the Logicians in a new and accurate translation, together with a detailed introduction that sets the work in its philosophical context. (shrink)

PYRRHONIAN SCEPTICISM, as presented in the writings of Sextus Empiricus, differs in various ways from the forms of scepticism that continue to be of such central concern to modern philosophers. Two differences stand out immediately. One is Pyrrhonism's practical orientation. For Sextus, scepticism is a way of life in which suspension of judgment leads to the peace of mind the sceptic identifies with happiness. The other is the puzzling failure on the part of the Pyrrhonists, along with all other ancient (...) sceptics, to formulate the sceptical problem that many modern and contemporary philosophers regard as fundamental and paradigmatic: the problem of our knowledge of the external world. (shrink)

A main epistemic problematic, found already in Aristotle’s Posterior Analytics, presents a threefold choice on how a belief may be justified: either through infinitely regressive reasoning, or through circular reasoning, or through reasoning resting ultimately on some foundation. Aristotle himself apparently takes the foundationalist option when he argues that rational intuition is a foundational source of scientific knowledge. The five modes of Agrippa, which pertain to knowledge generally, again pose the same problematic, the “Pyrrhonian” problematic. And here Galen and the (...) Stoics also opt for foundations. Sections I and II below explore that foundationalist option. Section III draws some lessons. And Section IV uses these to interpret Descartes. I argue that Descartes shows us the way beyond the Pyrrhonian problematic, although his way is not that traditionally attributed to him. On these basic issues of epistemology, Descartes is no Cartesian. (shrink)

We commonly speak of people as being ‘‘justified’’ or ‘‘unjustified’’ in believing as they do. These terms describe a person’s epistemic condition. To be justified in believing as one does is to have a positive epistemic status in virtue of holding one’s belief in a way which fully satisfies the relevant epistemic requirements or norms. This requires something more (or other) than simply believing a proposition whose truth is well-supported by evidence, even by evidence which one possesses oneself, since one (...) could entirely miss the relevance of this evidence and hold the belief as a result of wishful thinking or for some other bad reason. My topic in this paper is the notion of being justified which precludes beliefs flawed in this way. I will take the notion of something’s telling in favor of the truth of a proposition—that is, the notion of evidential support—for granted. (shrink)

Perin argues that theSceptic is engaged in the search for truth and that since this is so, the Sceptic aims to satisfy certain basic rational requirements.

Dialectical egalitarianism holds that every asserted proposition requires defence when challenged by an interlocutor. This view apparently generates a vicious 'regress of justifications', since an interlocutor can challenge the premises through which a speaker defends her original assertion, and so on ad infinitum . To halt the regress, dialectical foundationalists such as Adler, Brandom, Leite, and Williams propose that some propositions require no defence in the light of mere requests for justification. I argue that the putative regress is not worrisome (...) and that egalitarianism can handle it quite satisfactorily. I also defend a positive view that combines an anti-foundationalist conception of dialectical interaction with a foundationalist conception of epistemic justification. (shrink)