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)

I air three kinds of problem to which Sinnott-Armstrong's epistemological contrastivism seems to be exposed: (a) the theory gives an unplausible account of justification attributions; (b) the Pyrrhonism which results from its inability to identify relevant contrast classes bars us from epistemic responsibility; (c) contextualism does just as well as Pyrrhonism, despite Sinnott-Armstrong's arguments to the contrary.

Abstract: Ernest Sosa has recently articulated an insightful response to skepticism and, in particular, to the dream argument. The response relies on two independent moves. First, Sosa offers the imagination model of dreaming according to which no assertions are ever made in dreams and no beliefs are involved there. As a result, it is possible to distinguish dreaming from being awake, and the dream argument is blocked. Second, Sosa develops a virtue epistemology according to which in appropriately normal conditions our (...) perceptual beliefs will be apt. Hence, in these conditions, we will have at least animal knowledge, and the conclusion of the dream argument is undermined. In this article, I examine various moves that the skeptic can make to resist Sosa's challenge, and I contrast the proposal to a neo-Pyrrhonian stance. In the end, there is surprisingly little disagreement about the status of ordinary perceptual beliefs in the two stances. (shrink)

The basic thesis ofMichaelWilliams'book Unnatural Doubts is that sceptical doubts, at least of a Cartesian variety, are neither natural nor intuitive, but are, instead, the product of 'contentious and possibly dispensable theoretical preconceptions'. In particular, for Williams, scepticism arises because of a commitment to what he calls 'epistemic realism'. A fundamental thesis of my book Pyrrhonian Reflections on Knowledge and Justification is that scepticism (in its most challenging forms) is not based upon such prior theoretical commitments, but rather is the (...) natural outcome of unrestricted exploitation of a feature already present in our everyday concept of knowledge. Specifically, our everyday epistemic practices contain a useful mechanism that raises the level of evidential scrutiny in problematic settings. However, in the absence of psychological constraints (as in Hume) or pragmatic constraints (as in Peirce), this mechanism can generate an ever-widening range of undefeated possible defeaters- and with this, radical forms of scepticism emerge.Scepticism is not the result ofmounting the wronghorse (as Williams thinks),but the result of riding a serviceable horse too hard. With respect to Williams'own contextualist response, it is not clear whether, in the end, he avoids or embraces a strong version of scepticism. He claims that Cartesian doubts arise in a particular context, namely, the context of pursuing an epistemically realistic programme. In that context, according to Williams, Cartesian scepticism is unanswerable. His central claim, I take it, is that nothing compels us to do philosophy under these contextual constraints. In arguingthisway,however,Williamsseemsto have adopted a strongversion of relativism of just the sort traditionally exploited for sceptical purposes. To the claim 'It is all a matter of context', the correct response is, 'It had better not be- at least if you are trying to refute scepticism.'Perhaps Williams can produce a strongly contextualist position that does not slide into scepticism, and perhaps his appeal- rather late his book- to externalist consideration is intended to do this.But just as it is unclear whether contextualism can avoid scepticism, it is also unclear whether externalism has force against sensibly stated (even very strong) versions of scepticism. (shrink)

This work, written from a neo-Pyrrhonian perspective, is an examination of contemporary theories of knowledge and justification. It takes ideas primarily found in Sextus Empiricus's Outlines of Pyrrhonism, restates them in a modern idiom, and then asks whether any contemporary theory of knowledge meets the challenges they raise. The first part, entitled "Gettier and the Problem of Knowledge," attempts to rescue our ordinary concept of knowledge from those philosophers who have assigned burdens to it that it cannot bear. Properly understood, (...) Fogelin shows that the concept of knowledge is unproblematic. The second part of this study, called "Agrippa and the Problem of Justification," examines Agrippa's contribution to Pyrrhonism, a systematic reduction of its procedures which came to be known as the "Five Modes Leading to the Suspension of Belief." These modes present a completely general procedure for refuting any claim a dogmatist might make. Though largely unnoticed, there is, according to Fogelin, an uncanny resemblance between problems posed by Agrippa's "Five Modes" and those that contemporary epistemologists address under the heading of a theory of justification. Fogelin examines the strongest contemporary theories of justification--in both foundationalist and anti-foundationalist forms. The conclusion is that recent philosophical writings on justification have made no significant progress in responding to the Pyrrhonian problems these writings have addressed. (shrink)

A number of contemporary philosophers endorse a Pyrrhonian theme: that one has knowledge only if one knows or understands that one’s beliefs are reliably formed. Otherwise, one is like a man who grasps gold in the dark: such a man is successful, but his success is a matter of luck, and so not creditable to him. It is argued that the skeptical problem and the problem of moral luck share a common structure and a common solution. Specifically, a virtue-theoretic approach (...) helps us to understand important relations among luck, success and credit for success. It is argued that knowledge is an instance of success through virtue, and that, in general, success through virtue is creditable to the virtuous agent. (shrink)

In order for us to have epistemic justification, Sinnott-Armstrong believes we do not have to be able to rule out all sceptical hypotheses. He suggests that it is sufficient if we have 'modestly justified beliefs', i.e., if our evidence rules out all non-sceptical alternatives. I argue that modest justification is not sufficient for epistemic justification. Either modest justification is independent of our ability to rule out sceptical hypotheses, but is not a kind of epistemic justification, or else modest justification is (...) a kind of epistemic justification, but is not truly independent of our ability to rule out sceptical hypotheses. (shrink)

I outline Greco’s response to the Pyrrhonian challenge to epistemic externalist theories of knowledge and offer two points of criticism. I also argue, however, that there is an account of epistemic luck available which can cast some light on the dispute that Greco is concerned with, and which could, in principle at least, be regarded as being in the spirit of the proposal that Greco sets out.

I reply to comments by Gerry Hough, Peter Baumann and Martijn Blaauw on my book Moral Skepticisms. The main issues concern whether modest justifiedness is epistemic and how it is related to extreme justifiedness; how contrastivists can handle crazy contrast classes, indeterminacy and common language; whether Pyrrhonian scepticism leads to paralysis in decision-making or satisfies our desires to evaluate beliefs as justified or not; and how contextualists can respond to my arguments against relevance of contrast classes.

General contrastivism holds that all claims of reasons are relative to contrast classes. This approach applies to explanation (reasons why things happen), moral philosophy (reasons for action), and epistemology (reasons for belief), and it illuminates moral dilemmas, free will, and the grue paradox. In epistemology, contrast classes point toward an account of justified belief that is compatible with reliabilism and other externalisms. Contrast classes also provide a model for Pyrrhonian scepticism based on suspending belief about which contrast class is relevant. (...) This view contrasts with contextualism, invariantism, and Schaffer's contrastivism. (shrink)

This précis summarizes my book Moral Skepticisms, with emphasis on my contrastivist analysis of justified moral belief and my Pyrrhonian moral scepticism based on meta-scepticism about relevance. This complex moral epistemology escapes a common paradox facing moral philosophers.

All contentious moral issues--from gay marriage to abortion and affirmative action--raise difficult questions about the justification of moral beliefs. How can we be justified in holding on to our own moral beliefs while recognizing that other intelligent people feel quite differently and that many moral beliefs are distorted by self-interest and by corrupt cultures? Even when almost everyone agrees--e.g. that experimental surgery without consent is immoral--can we know that such beliefs are true? If so, how? These profound questions lead to (...) fundamental issues about the nature of morality, language, metaphysics, justification, and knowledge. They also have tremendous practical importance in handling controversial moral questions in health care ethics, politics, law, and education. Sinnott-Armstrong here provides an extensive overview of these difficult subjects, looking at a wide variety of questions, including: Are any moral beliefs true? Are any justified? What is justified belief? The second half of the book explores various moral theories that have grappled with these issues, such as naturalism, normativism, intuitionism, and coherentism, all of which are attempts to answer moral skepticism. Sinnott-Armstrong argues that all these approaches fail to rule out moral nihilism--the view that nothing is really morally wrong or right, bad or good. Then he develops his own novel theory,--"moderate Pyrrhonian moral skepticism"--which concludes that some moral beliefs can be justified out of a modest contrast class but no moral beliefs can be justified out of an extreme contrast class. While explaining this original position and criticizing alternatives, Sinnott-Armstrong provides a wide-ranging survey of the epistemology of moral beliefs. (shrink)

Throughout the history of philosophy, skepticism has posed one of the central challenges of epistemology. Opponents of skepticism--including externalists, contextualists, foundationalists, and coherentists--have focussed largely on one particular variety of skepticism, often called Cartesian or Academic skepticism, which makes the radical claim that nobody can know anything. However, this version of skepticism is something of a straw man, since virtually no philosopher endorses this radical skeptical claim. The only skeptical view that has been truly held--by Sextus, Montaigne, Hume, Wittgenstein, and, (...) most recently, Robert Fogelin--has been Pyrrohnian skepticism. Pyrrhonian skeptics do not assert Cartesian skepticism, but neither do they deny it. The Pyrrhonian skeptics' doubts run so deep that they suspend belief even about Cartesian skepticism and its denial. Nonetheless, some Pyrrhonians argue that they can still hold "common beliefs of everyday life" and can even claim to know some truths in an everyday way. This edited volume presents previously unpublished articles on this subject by a strikingly impressive group of philosophers, who engage with both historical and contemporary versions of Pyrrhonian skepticism. Among them are Gisela Striker, Janet Broughton, Don Garrett, Ken Winkler, Hans Sluga, Ernest Sosa, Michael Williams, Barry Stroud, Robert Fogelin, and Roy Sorensen. This volume is thematically unified and will interest a broad spectrum of scholars in epistemology and the history of philosophy. (shrink)

This report is also a consolidated response to three memoranda. The legal division requested an historical review as patent support. Engineering has solicited input on product development. Thirdly, I am responding to a plea from the Personnel Department. Their headhunters have asked for more specific advice on how to recruit skeptics.

Robert Fogelin agrees that arguments for Cartesian sceptism carry a heavy burden of theoretical commitment, for they take for granted, explicitly or implicitly, the foundationalist's idea that experimental knowledge is in some fully general way 'epistemologically prior' to knowledge of the world. He thinks, however, that there is a much more direct and commonsensical route to scepticism. Ordinary knowledge-claims are accepted on the basis of justificatory procedures that fall far short of eliminating all conceivable error-possibilities. As a result, it is (...) always possible, by bringing new errorpossibilities into play, to raise the 'level of scrutiny' to which a given knowledge-claim is subject, so that it no longer seems adequately justified. Philosophical theories of justification can be seen as attempts to repair this fragility of ordinary knowledge. But they fail, all succumbing to the Pyrrhonian modes of assumption, circularity or infinite regress. I argue that Fogelin's conception of varying levels of scrutiny leads at most to fallibilism and not to radical scepticism. More importantly, I show that changing the range of relevant defeaters to a given knowledge claim can do more that impose stricter standards for justification: it can change the subject by altering the direction of inquiry. We see from this that the introduction of 'sceptical hypotheses' (such as that Descartes's Evil Deceiver) are not best seen as raising standards to some maximal level but as introducing a new kind of evaluation which, without commitment to what I call 'epistemological realism,' does nothing to impugn the justificational status of ordinary knowledge-claims entered in ordinary contexts. (shrink)