Ralph Wedgwood

This chapter is concerned with the distinction that most contemporary epistemologists express by distinguishing between “propositional” and “doxastic” justification. The goal is to develop an account of this distinction that applies, not just to full or outright beliefs, but also to partial credences—and indeed, in principle, to attitudes of all kinds. The standard way of explaining this distinction, in terms of the “basing relation”, is criticized, and an alternative account—the “virtue manifestation” account—is proposed in its place. This account has a certain kinship with the epistemological approach that is known as “reliabilism”, but it also has certain key differences—above all, it is compatible with an internalist view of rationality.

Often, when one faces a choice between alternative actions, there are reasons both for and against each alternative. On one way of understanding these words, what one “ought to do all things considered (ATC)” is determined by the totality of these reasons. So, these reasons can somehow be “combined” or “aggregated” to yield an ATC verdict on these alternatives. First, various assumptions about this sort of aggregation of reasons are articulated. Then it is shown that these assumptions allow for the proof of a “Reasons Aggregation Theorem” – parallel to John Harsanyi’s 1955 “Social Aggregation Theorem”. All reasons for action are grounded in reason-providing values; and, for every such reason-providing value, there is in principle a way of measuring how strongly this value counts against each alternative. The theorem tells us that the appropriate measure of how much reason ATC there is against each alternative is simply a weighted sum of the strengths with which these values count against that alternative; the agent ought not ATC to perform an action iff there is ATC more reason against it than against some available alternative.

Many philosophers think that internalism supports a noncognitivist account of normative judgments, according to which these judgments do not count as genuine beliefs, but rather as non-cognitive states of some kind. Such noncognitivist accounts of normative judgments naturally accompany an expressivist account of the meaning of normative statements. This chapter considers the prospects of such an expressivist theory, taking as its paradigm the most recent theory of Allan Gibbard. It is argued that this theory is vulnerable to a strengthened form of the objection that P. T. Geach derived from the work of Frege. This makes it plausible that expressivist accounts face insuperable problems, and so that both expressivism and non-cognitivism should be rejected.

Philosophers have long distinguished between practical and theoretical rationality. The first section of this chapter begins by discussing the ways in which this distinction was drawn by Aristotle and Kant; then it sketches what seems to be the general consensus today about how, at least roughly, the distinction should be drawn. The rest of this chapter explores what practical and theoretical rationality have in common: in the second section, several parallels between practical and theoretical rationality are outlined, and it is argued that these parallels make it plausible that a unifying account of rationality can be given. Finally, in the third section, a number of such unifying accounts of practical and theoretical rationality are surveyed. These include accounts that are inspired in various ways by Hume and by the results of formal decision theory, as well as views that appeal to reasons and to the distinctive value of correct or appropriate attitudes.

This essay explores the following position: Ultimate moral principles are a priori truths; hence, it is irrational to assign a non-zero credence to any proposition that is incompatible with these ultimate moral principles ; and this sort of irrationality, if it could have been avoided, is in a sense inexcusable. So—at least if moral relativism is false—in any disagreement about ultimate moral principles, at least one party to the disagreement is inexcusably irrational. This position may seem extreme, but it is argued that it is more plausible than it first appears.

What is normativity? It is argued here that normativity is best understood as a property of certain concepts: normative thoughts are those involving these normative concepts; normative statements are statements that express normative thoughts; and normative facts are the facts (if such there be) that make such normative thoughts true. Many philosophers propose that there is a single basic normative concept—perhaps the concept of a reason for an action or attitude—in terms of which all other normative concepts can be defined. It is argued here that this proposal faces grave difficulties. According to a better proposal, what these normative concepts have in common is that they have a distinctive sort of conceptual role—a reasoning-guiding conceptual role. This proposal is illustrated by a number of examples: different normative concepts differ from each other in virtue of their having different conceptual roles of this reasoning-guiding kind.

An account of Plato’s theory of knowledge is offered. Plato is in a sense a contextualist: at least, he recognizes that his own use of the word for “knowledge” varies – in some contexts, it stands for the fullest possible level of understanding of a truth, while in other contexts, it is broader and includes less complete levels of understanding as well. But for Plato, all knowledge, properly speaking, is a priori knowledge of necessary truths – based on recollection of aspects of the Forms – and so in contemporary terms, it meets the conditions of “safety” and “adherence” (or “indefeasibility”) to the highest degree. This account is defended on the basis of the text of Meno, Phaedo, and the Republic, against some objections – especially objections that are due to Gail Fine.

According to a widely held view of the matter, whenever we assess beliefs as ‘rational’ or ‘justified’, we are making normative judgements about those beliefs. In this discussion, I shall simply assume, for the sake of argument, that this view is correct. My goal here is to explore a particular approach to understanding the basic principles that explain which of these normative judgements are true. Specifically, this approach is based on the assumption that all such normative principles are grounded in facts about values, and the normative principles that apply to beliefs in particular are grounded in facts about alethic value––a kind of value that is exemplified by believing what is true and not believing what is false. In this chapter, I shall explain what I regard as the best way of interpreting this approach. In doing so, I shall also show how this interpretation can solve some problems that have recently been raised for approaches of this kind by Selim Berker, Jennifer Carr, Michael Caie, and Hilary Greaves.

There are three well-known models of how to account for perceptual belief within a probabilistic framework: (a) a Cartesian model; (b) a model advocated by Timothy Williamson; and (c) a model advocated by Richard Jeffrey. Each of these models faces a problem—in effect, the problem of accounting for the defeasibility of perceptual justification and perceptual knowledge. It is argued here that the best way of responding to this the best way of responding to this problem effectively vindicates the Cartesian model. Finally, it is argued that, given the best interpretation of the probabilistic framework, that the Cartesian model is not vulnerable to the main criticisms that have been raised against it.

As a young Anglican clergyman, Joseph Butler published the first edition of his Fifteen Sermons Preached at the Rolls Chapel in 1721; a revised edition appeared in 1729. Almost immediately, it was widely understood that these sermons present a strikingly subtle and careful form of a relatively traditional conception of ethics, in contrast to the more radical views of other philosophers such as Thomas Hobbes. Only a few years later, David Hume was much concerned to assimilate Butler's insights, while himself arguing for more radical views; and those who sought to respond to Hume, such as Richard Price and Thomas Reid, drew deeply on Butler's thought.Such early utilitarians as Jeremy Bentham and J. S....

This essay examines the epistemology of evaluative, and especially moral, thinking, and attempts an analysis of value-concepts. It proposes an account according to which sentiment plays a central role in all rational evaluative thinking. But this account diverges sharply from traditional emotivism: it insists that rational evaluative thinking must be principled; it defends the pursuit of systematic moral theory through seeking reflective equilibrium; and, though committed to holding that value-judgments can be straightforwardly true, it is compatible with many metaphysical positions about the nature of evaluative truth, ranging from subjectivism to non-reductive realism about values. ;First, a general conception of epistemology and conceptual analysis is articulated. A philosophical study of a concept should offer a non-circular account of what it is to grasp the concept; and grasp of a concept involves mastery of the basic rules for forming rational beliefs involving the concept. ;Value-concepts, it is proposed, are essentially practical. This implies internalism: value-judgments are essentially connected to an actual or imagined motivation to act accordingly. To avoid circularity, such an internalist account must assign an evidential role in evaluative thinking to emotions or sentiments. ;As guides to evaluative truth, sentiments are highly fallible. But one can counteract this fallibility only by constructing a set of general principles, through seeking reflective equilibrium on the basis of one's sentiments, and thereby simultaneously refining both one's sentiments and one's value-judgments. ;According to this account, rational evaluative thinking is principled reliance on sentiment A discussion of the emotions shows that this account of value-concepts is not circular; and it is indicated how the metaphysical questions, about what it is for value-judgments to be true, could be resolved. ;Moral judgments differ from other value-judgments in demanding, not just theoretical agreement about what is true, but practical agreement about what is to be done; and moral sentiments stem from a capacity to respond emotionally to facts about people's interests regardless of how exactly one is related to those interests oneself. Finally, various sceptical challenges to our moral capacities are considered

Here is a definition of knowledge: for you to know a proposition p is for you to have an outright belief in p that is correct precisely because it manifests the virtue of rationality. This definition resembles Ernest Sosa’s “virtue theory”, except that on this definition, the only virtue that must be manifested in all instances of knowledge is rationality, and no reductive account of rationality is attempted—rationality is assumed to be an irreducibly normative notion. This definition is compatible with “internalism” about rationality, and with a form of “pragmatic encroachment” on the conditions of rational outright belief. An interpretation is given of this definition, and especially of the sense of ’because’ that it involves. On this interpretation, this definition entails that both safety and adherence are necessary conditions on knowledge; it supports a kind of contextualism about terms like ‘knowledge’; and it provides resources to defend safety, adherence, and contextualism, against some recent objections.

Many philosophers have claimed that “belief aims at the truth”. But is there any interpretation of this claim on which it counts as true? According to some philosophers, the best interpretation of the claim takes it as the normative thesis that belief is subject to a truth-norm. The goal of this essay is to clarify this normative interpretation of the claim. First, the claim can be developed so that it applies to partial beliefs as well as to flat-out full beliefs. Secondly, an answer is given to the objection that has been raised against the claim that belief is subject to a truth-norm of this sort by Krister Bykvist and Anandi Hattiangadi; responding to this objection will involve careful reflection on the structure of normative concepts, and of how these normative concepts apply to belief.

Is there any distinctive aspect of rationality that deserves the label of “instrumental rationality”? Recently, Joseph Raz (2005) has argued that instrumental rationality is a “myth”. In this essay, I shall give some qualified support to Raz’s position: as I shall argue, many philosophers have indeed been seduced by certain myths about instrumental rationality. Nonetheless, Raz’s conclusion is too strong. Instrumental rationality is not itself a myth: there really is a distinctive aspect of rationality that deserves the label of “instrumental rationality”. In the first two sections of this essay, I shall start by giving a rough intuitive description of the phenomenon that seems to me the best candidate for the label “instrumental rationality”. As we shall see, this rough description gives us reason to reject some of the myths that surround instrumental rationality. Then in the rest of this essay, I shall try to give a more precise general specification of this phenomenon. In Sections 3 and 4, I shall consider what has been said about instrumental rationality by several other philosophers. Identifying what is missing in these other philosophers’ accounts will help me to develop my own positive specification, which I shall present in Sections 5 and 6.

If beliefs are subject to a basic norm of correctness—roughly, to the principle that a belief is correct only if the proposition believed is true—how can this norm guide believers in forming their beliefs? Answer: this norm guides believers indirectly: believers are directly guided by requirements of rationality—which are themselves explained by this norm of correctness. The fundamental connection between rationality and correctness is probabilistic. Incorrectness comes in degrees; for beliefs, these degrees of incorrectness are measured by quadratic scoring rules, such as the so-called Brier score. This account is defended against objections; and its implications for suspension of judgement are explored

According to John Broome, akrasia consists in a failure to intend to do something that one believes one ought to do, and such akrasia is necessarily irrational. In fact, however, failing to intend something that one believes one ought to do is only guaranteed to be irrational if one is certain of a maximally detailed proposition about what one ought to do; if one is uncertain about any part of the full story about what one ought to do, it could be perfectly rational not to intend to do something that one believes one ought to do. This paper seeks to remedy this problem, by proposing an anti-akrasia principle that covers cases of uncertainty (as well as cases of such complete certainty). It is argued that this principle is in effect the fundamental principle of practical rationality.

According to the anti-Humean theory of motivation, it is possible to be motivated to act by reason alone. According to the Humean theory of motivation, this is impossible. The debate between these two theories remains as vigorous as ever (see for example Pettit 1987, Lewis 1988, Price 1989 and Smith 1994). In this paper I shall argue that the anti-Humean theory of motivation is incompatible with a number of prominent recent theories of content. I shall focus on causal or informational theories of content (such as Dretske 1981, Fodor 1990 and Stalnaker 1984), and on verificationist theories of content (such as Dummett 1993, Putnam 1983 and Wright 1986), though in fact I believe that the same argument applies to several other theories of content as well.

This essay offers an account of the truth conditions of sentences involving deontic modals like ‘ought’, designed to capture the difference between objective and subjective kinds of ‘ought’ This account resembles the classical semantics for deontic logic: according to this account, these truths conditions involve a function from the world of evaluation to a domain of worlds (equivalent to a so-called “modal base”), and an ordering of the worlds in such domains; this ordering of the worlds itself arises from two further elements – a probability function and a value function – since this ordering ranks the worlds in accordance with the expected value of certain propositions that are true at those worlds. Thus, a proposition of the form ‘Ought (p)’ is true at a world of evaluation w if and only if p is true at all the top-ranked worlds in the domain assigned to w. This domain of worlds consists of metaphysically possible worlds, while the probability function is defined over a space of epistemically possible worlds (which may include metaphysically impossible worlds, such as worlds where Hesperus is not Phosphorus). Evidence is given that this account assigns the correct truth conditions to a wide range of sentences involving ‘ought’. Since these truth conditions involve both a domain of metaphysically possible worlds and a space of epistemically possible worlds, there are two corresponding kinds of conditional involving ‘ought’, depending on which space of worlds is restricted by the conditional. Finally, some objections that might be raised against this account are answered.