This book is concerned with the alleged capacity of the human mind to arrive at beliefs and knowledge about the world on the basis of pure reason without any dependence on sensory experience. Most recent philosophers reject the view and argue that all substantive knowledge must be sensory in origin. Laurence BonJour provocatively reopens the debate by presenting the most comprehensive exposition and defence of the rationalist view that a priori insight is a genuine basis for knowledge. This important book (...) will be at the centre of debate about the theory of knowledge for many years to come. (shrink)

This book is a defense of modal realism; the thesis that our world is but one of a plurality of worlds, and that the individuals that inhabit our world are only a few out of all the inhabitants of all the worlds. Lewis argues that the philosophical utility of modal realism is a good reason for believing that it is true.

Metaethics, understood as a distinct branch of ethics, is often traced to G. E. Moore's 1903 classic, Principia Ethica. Whereas normative ethics is concerned to answer first order moral questions about what is good and bad, right and wrong, metaethics is concerned to answer second order non-moral questions about the semantics, metaphysics, and epistemology of moral thought and discourse. Moore has continued to exert a powerful influence, and the sixteen essays here represent the most up-to-date work in metaethics after, and (...) in some cases directly inspired by, the work of Moore. (shrink)

It is often claimed that irreducibly normative truths would have unacceptable metaphysical implications, and are incompatible with a scientific view of the world. The book argues, on the basis of a general account of the relevance of ontological questions, that this claim is mistaken. It is also a mistake to think that interpreting normative judgments as beliefs would make it impossible to explain their connection with action. An agent’s acceptance of a normative judgment can explain that agent’s subsequent action because (...) it is part of being a rational agent that such an agent’s beliefs about reasons normally, but not invariably, make a difference to the agent’s subsequent behavior. Because facts about reasons are not entities existing apart from us, there is no epistemological problem of how we can “be in touch with” such facts. There are serious worries about normative knowledge, but the problems involved are internal to the normative domain itself. The best solution to these problems would be an overall account of the domain of reasons in normative terms, supported by an argument from reflective equilibrium. But no existing account, constructivist, or based on desires or on an idea of rationality, is plausible, and no alternative is likely to succeed. Conclusions about reasons for action must rest on more piecemeal applications of the method of reflective equilibrium. (shrink)

This is a major work in moral philosophy, the long-awaited follow-up to Parfit's 1984 classic Reasons and Persons, a landmark of twentieth-century philosophy. Parfit now presents a powerful new treatment of reasons and a critical examination of the most prominent systematic moral theories, leading to his own ground-breaking conclusion.

Modern empiricism has been conditioned in large part by two dogmas. One is a belief in some fundamental cleavage between truths which are analytic, or grounded in meanings independently of matters of fact, and truth which are synthetic, or grounded in fact. The other dogma is reductionism: the belief that each meaningful statement is equivalent to some logical construct upon terms which refer to immediate experience. Both dogmas, I shall argue, are ill founded. One effect of abandoning them is, as (...) we shall see, a blurring of the supposed boundary between speculative metaphysics and natural science. Another effect is a shift toward pragmatism. (shrink)

The prospects for moral realism and ethical naturalism have been important parts of recent debates within metaethics. As a first approximation, moral realism is the claim that there are facts or truths about moral matters that are objective in the sense that they obtain independently of the moral beliefs or attitudes of appraisers. Ethical naturalism is the claim that moral properties of people, actions, and institutions are natural, rather than occult or supernatural, features of the world. Though these metaethical debates (...) remain unsettled, several people, myself included, have tried to defend the plausibility of both moral realism and ethical naturalism. I, among others, have appealed to recent work in the philosophy of language—in particular, to so-called theories of “direct reference” —to defend ethical naturalism against a variety of semantic worries, including G. E. Moore's “open question argument.” In response to these arguments, critics have expressed doubts about the compatibility of moral realism and direct reference. In this essay, I explain these doubts, and then sketch the beginnings of an answer—but understanding both the doubts and my answer requires some intellectual background. (shrink)

Moral Realism is a systematic defence of the idea that there are objective moral standards. Russ Shafer-Landau argues that there are moral principles that are true independently of what anyone, anywhere, happens to think of them. His central thesis, as well as the many novel supporting arguments used to defend it, will spark much controversy among those concerned with the foundations of ethics.

This book offers a unified collection of published and unpublished papers by Robert Audi, a renowned defender of the rationalist position in ethics. Taken together, the essays present a vigorous, broadly-based argument in moral epistemology and a related account of reasons for action and their bearing on moral justification and moral character. Part I details Audi's compelling moral epistemology while Part II offers a unique vision of ethical concepts and an account of moral explanation, as well as a powerful model (...) of moral realism. Part III extends this account of moral explanation to moral responsibility for both actions and character and to the relation between virtue and the actions that express it. Part IV elaborates a theory of reasons for action that locates them in relation to three of their traditionally major sources: desire, moral judgment, and value. Clear and illuminating, Audi's introduction outlines and interconnects the self-contained but cumulatively arranged essays. It also places them in relation to classical and contemporary literature, and directs readers to large segments of thematically connected material spread throughout the book. Audi ends with a powerfully synthetic final essay. (shrink)

The purpose of this paper is to defend G. E. Moore's open question argument, understood as an argument directed against analytic reductionism, the view that moral properties are analytically reducible to non-moral properties. In the first section I revise Moore's argument in order to make it as plausible and resistant against objections as possible. In the following two sections I develop the argument further and defend it against the most prominent objections raised against it. The conclusion of my line of (...) reasoning is that the open question argument offers the best explanation of our responses to the questions put in the argument, namely that analytic reductionism is mistaken. (shrink)

Principia Ethica set the agenda for analytical metaethics. Moore’s unrelenting focus on fundamentals both brought metaethics into view as a potentially separate area of philosophical inquiry and provided a model of the analytical techniques necessary to pursue it.1 Moore acknowledged that he wasn’t the first to insist on a basic irreducible core of all ethical concepts. Although he seems not to have appreciated the roots of this thought in eighteenth-century intuitionists like Clarke, Balguy, and Price, not to mention sentimentalists like (...) Hutcheson and Hume, Moore gave full marks to Sidgwick. According to Moore, Sidgwick was the “only . . . ethical writer” to have clearly seen the irreducibility of ethics’ defining notion.2 Nevertheless, twentieth-century meta-. (shrink)

I am very grateful to my critics for the time and effort that they have devoted to my work.

A century after its publication, G.E. Moore''sPrincipia Ethica stands as one of theclassic statements of anti-naturalism inethics. Moore claimed that the most basic ethicalproperties were denoted by `good'' and `bad'' andthat all naturalist accounts of thoseproperties were inadequate. His open-questionargument aimed to refute any proposedidentification of good with some naturalproperty, and Moore concluded from theargument that good must be a nonnaturalproperty.The received view is that the open-questionargument is a failure. In this paper,my aim is to breathe some life back intoMoore''s (...) argument. My plan for doing so beginsby presenting the standard interpretation ofthe argument and then showing that there isan alternative to that interpretation. Thealternative is not developed at any length byMoore and stands in need of some elaboration. Isuggest a way of elaborating theargument and then show that the standardcriticisms of Moore fail to undermine thisalternative version of the open-questionargument. (shrink)