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Many philosophers have challenged the problem of skepticism. I argue that none of them successfully dispute the system established by Sextus Empiricus. But not just that; the main thesis proposed is that this kind of skepticism is unsolvable. I maintain that there are two fundamental strategies in Sextus' Outlines of Phyrrhonism. One of them is that the basic description of skepticism has a paradoxical character. The other focuses on the Five Modes of Agrippa that comprise a system of dialectical moves for suspending judgment. The modes have, as a system, the capacity to reposition in any circumstance, so it is impossible to justify to the skeptic why he needs to abandon his skepticism. I explain, in brief, why the most important objections to skepticism do not solve this challenge. In opposition to common view, I argue that Sextus' phyrrhonism is practicable, coherent and consistent. Although there is no possible solution to skepticism, there is at least a general way to answer it without contradiction, infinite regression or becoming a skeptic.

We are strongly inclined to believe in moral responsibility, that some human agents truly deserve moral praise or blame for some of their actions. However, recent philosophical discussion has put this natural belief in the reality of moral responsibility under suspicion. There are important reasons to think that moral responsibility is incompatible with both determinism and indeterminism, possibly rendering moral responsibility an impossibility. This book lays out the major arguments for skepticism about moral responsibility and subjects them to sustained and penetrating critical analysis. Moral Responsibility lays out the intricate dialectic involved in these issues in a helpful and accessible way. The book goes on to suggest a way in which skepticism can be avoided, arguing that an excessive pre-eminence given to the will might lie at the root of skepticism of moral responsibility. Carlos Moya offers an alternative to skepticism, showing how a cognitive approach to moral responsibility which stresses the importance of belief would rescue our natural and centrally important faith in the reality of moral responsibility.

‘Skepticism’ refers primarily to two positions. Knowledge skepticism says there is no such thing as knowledge, and justification skepticism denies the existence of justified belief. How closely the two views are related depends on the relationship between knowledge and justification: if knowledge entails justified belief, as many theorists say, then justification skepticism entails knowledge skepticism (but not vice versa). Either form of skepticism can be limited in scope. Global (or radical) skepticism challenges the epistemic credentials of all beliefs, saying that no one knows anything, or no belief is justified. More local skepticism is restricted to some domain; thus some skeptics question the epistemic credentials of beliefs about other minds (but not beliefs about one’s own mind), or beliefs concerning empirical matters (but not concerning a priori matters).

This essay offers a new interpretation of Nietzsche's argument for moral skepticism (i.e., the metaphysical thesis that there do not exist any objective moral properties or facts), an argument that should be of independent philosophical interest as well. On this account, Nietzsche offers a version of the argument from moral disagreement, but, unlike familiar varieties, it does not purport to exploit anthropological reports about the moral views of exotic cultures, or even garden-variety conflicting moral intuitions about concrete cases. Nietzsche, instead, calls attention to the single most important and embarrassing fact about the history of moral theorizing by philosophers over two millennia: namely, that no rational consensus has been secured on any substantive, foundational proposition about morality. Persistent and apparently intractable disagreement on foundational questions, of course, distinguishes moral theory from inquiry in the sciences and mathematics (perhaps in kind, certainly in degree). According to Nietzsche, the best explanation for this disagreement is that, even though moral skepticism is true, philosophers can still construct valid dialectical justifications for moral propositions because the premises of different justifications will answer to the psychological needs of at least some philosophers and thus be deemed true by some of them. The essay concludes by considering various attempts to defuse this abductive argument for skepticism based on moral disagreement and by addressing the question whether the argument "proves too much," that is, whether it might entail an implausible skepticism about a wide range of topics about which there is philosophical disagreement.

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.

To hold an error theory about morality is to endorse a kind of radical moral skepticism—a skepticism analogous to atheism in the religious domain. The atheist thinks that religious utterances, such as “God loves you,” really are truth-evaluable assertions (as opposed to being veiled commands or expressions of hope, etc.), but that the world just doesn’t contain the items (e.g., God) necessary to render such assertions true. Similarly, the moral error theorist maintains that moral judgments are truth-evaluable assertions (thus contrasting with the noncognitivist), but that the world doesn’t contain the properties (e.g., moral goodness, evil, moral obligation) needed to render moral judgments true. In other words, moral discourse aims at the truth but systematically fails to secure it. If there is no such property as moral wrongness, for example, then no judgment of the form “X is morally wrong” will be true (where “X” denotes an actual action or state of affairs). Advocates of this position include Hinckfuss 1987; Joyce 2001; Mackie 1977 (see MACKIE, J. L.). Various forms of moral skepticism—some of which are arguably instances of the error theoretic stance—have been familiar to philosophers since ancient times. (See SKEPTICISM, MORAL.) Error theoretic views can be controversial—as in the case of religion and morality—or widely agreed upon—as in the case of ghosts and phlogiston. It is important to note that error theorists maintain that the judgments in question are erroneous not merely because of the absence of any objective moral facts sufficient to render them true, but also because of the absence of any non-objective moral facts sufficient to render them true. There is, for example, a kind of moral realist who maintains that moral properties are objective features of the universe (see REALISM, MORAL). There is also a family of metaethical views according to which moral properties are in some manner constituted by us—by our beliefs, attitudes, practices, etc..

Skeptical theism - a strategy for dealing with so-called ‘evidential arguments from evil’ - is often held to lead to moral skepticism. In this paper I look at some of the responses open to the skeptical theist to the contention that her position leads to moral skepticism, and argue that they are ultimately unsuccessful, since they leave the skeptical theist with no grounds for ruling out the possibility of maximal divine deception. I then go on to argue that the situation is particularly bleak for the skeptical theist, since the most prominent ways of dealing with this pervasive type of skepticism are not available to her. Furthermore, since this pervasive type of skepticism entails moral skepticism, it follows that moral skepticism will after all have found a way in ‘through the back door’. In order to solidify my case, I go on to outline and deal with three potential objections.

What is skepticism? -- Skepticism as selective doubt -- Scientific method and rational skepticism -- Skepticism and the new enlightenment -- The growth of antiscience -- Skepticism, science, and the paranormal -- Should skeptical inquiry be applied to religion? -- Skepticism and religion -- Are science and religion compatible? -- Skepticism and political inquiry -- Skepticism and ethical inquiry -- Moral faith and ethical skepticism reconsidered -- Skepticism and eupraxsophy -- The new skepticism: a worldwide movement -- Skeptical inquiry: my personal involvement -- Science and the public: summing up thirty years of the skeptical inquirer -- The new skepticism: a statement of principles.

According to global skepticism, we know nothing. According to local skepticism, we know nothing in some particular area or domain of discourse. Unlike their global counterparts, local skeptics think they can contain our invincible ignorance within limited bounds. I argue that they are mistaken. Local skepticism, particularly the kinds that most often get defended, cannot stay local: if there are domains whose truths we cannot know, then there must be claims outside those domains that we cannot know even if they are true. My argument focuses on one popular form of local skepticism, ethical skepticism, but I believe that the argument generalizes to cover other forms as well.

This book reassesses the role and impact of skepticism in early modern philosophy, revisiting and reinterpreting the positions of some of the main early modern ...