Derek Parfit (1942-2017) is the most famous philosopher you've likely never heard of. In 1984, Parfit published what was, and is still, hailed by many philosophers as a work of genius - one of the most cited works of philosophy since World War II, Reasons and Persons. At its core, he argued that we should be concerned less with our own interests and more with the common good. His book brims with brilliant argumentative detail and stunningly inventive thought (...) experiments that challenged contemporary views about what it means to be a person, why one should forego concern for oneself as an identity that persists over time, what it means to act on the basis of reasons, and what we owe to future generations. Parfit also - unfashionably at the time - believed in a kind of grand unified theory of morality, what he called theory x, a non-religious ethical theory wherein all the major moral theories were converging from different sides on the same mountaintop. Parfit has had an enormous influence not only on philosophy, but also beyond, particularly amongst those in the fields of climate ethics, poverty relief, and charitable giving. In this book, the first-full scale biography of Parfit, Dave Edmonds tells the story of the thinker that many philosophers consider the most important moral philosopher of the last century. Edmonds' rendering of the man in full skilfully illuminates the person behind the acclaimed philosopher. Despite Parfit's extraordinary mind, outward appearances suggest his was also an extraordinarily uneventful life - one largely spent in cloistered institutions from Eton to Oxford and one seemingly monomaniacally devoted to ideas. Edmonds' aim is to show how this son and grandson of missionaries went from a genial and outgoing history student to a captivating, yet monkish philosopher singularly devoted to saving morality. In doing so, Edmonds makes Parfit's profound, but often impenetrable, ideas accessible to a broad audience and gives life and body to the thoughts of a seemingly pure thinker that captured the imagination of a generation of philosophers. (shrink)

This paper starts by juxtaposing the normative ethics in the final part of Parfit's final book, On What Matters, vol. 3, with the normative ethics in his earlier books, Reasons and Persons and On What Matters, vol. 1. The paper then addresses three questions. The first is, where does the reflective-equilibrium methodology that Parfit endorsed in the first volume of On What Matters lead? The second is, is the Act-involving Act Consequentialism that Parfit considers in the final (...) volume of On What Matters as plausible as Rossian deontology? The third is, how is the new argument that Parfit puts forward for Rule Consequentialism supposed to work? (shrink)

Parfit denies that the introduction of reasons into our ontology is costly for his theory. He puts forth two positions to help establish the claim: the Plural Senses View and the Argument from Empty Ontology. I argue that, first, the Plural Senses View for ‘exists’ can be expanded to allow for senses which undermine his ontological claims; second, the Argument from Empty Ontology can be debunked by Platonists. Furthermore, it is difficult to make statements about reasons true unless these (...) statements include reference to objects in reality. These arguments show the instability of Parfit’s claimed metaethical advantages over naturalism. [Open access]. (shrink)

In der Diskussion um personale Identität nehmen die einflussreichen Arbeiten Derek Parfits eine Sonderstellung ein, insofern Parfit nicht bestrebt ist, eines der gängigen Identitätskriterien zu verteidigen, sondern vielmehr behauptet, dass unsere alltäglichen wie philosophischen Vorstellungen von personaler Identität unrettbar inkohärent sind und deshalb aufgegeben werden sollten. In seinem Beitrag beleuchtet Sascha Settegast die verschiedenen Argumente, die Parfit für diese provokante These vorbringt, und unternimmt insbesondere den Versuch einer systematischen Dekonstruktion der wichtigsten Gedankenexperimente Parfits, die zeigen soll, dass sich (...) diese Gedankenexperimente auf eine Weise auflösen lassen, die unsere alltäglichen Intuitionen über personale Identität intakt belässt. Settegast entwickelt dabei die Grundzüge einer Konzeption personaler Identität, die sich einerseits von den gängigen neo-lockeanischen und animalistischen Ansätzen abgrenzt und andererseits bewusst an den zeitgenössischen Neo-Aristotelismus in der Ethik anknüpft, wie er etwa bei Philippa Foot und Michael Thomp-son anzutreffen ist. Die diachrone numerische Identität menschlicher Personen gründet nach Settegasts Auffassung darin, dass der Verlauf ihres Lebens eine zeitliche Einheit aufweist, die dadurch bedingt ist, dass ihre Lebensführung die menschliche Lebensform auf eine individuell charakteristische Weise exemplifiziert. Insofern dies aber nur durch Kultivierung der Tugen-den zu erreichen ist, handelt es sich laut Settegast bei personaler Identität letztlich nicht um eine Tatsache, die einfach vorliegt oder nicht, sondern um eine Aufgabe, die uns als Menschen gegeben ist und wesentlich darin besteht, in bewusster Orientierung auf das gute Leben hin ein stabiles, sich zeitlich durchhaltendes Selbst allererst auszubilden. (shrink)

Thomas Scanlon and Derek Parfit have recently defended a meta-ethical view that is supposed to satisfy realistic intuitions about morality, without the metaphysical implications that many find hard to accept in other realist views. Both philosophers argue that truths in the normative domain do not have ontological implications, while truths in the scientific domain presuppose a metaphysical reality. What distinguishes Scanlon and Parfit’s approach from other realistic meta-ethical theories is that they maintain that normative entities exist in a (...) way that is different from (some) non-normative entities. Moreover, they think that this view about the way normative entities exist helps to answer the metaphysical worries that are often thought to plague non-naturalism. To make sense of this idea, I develop their view as a version of alethic pluralism: the position that there is more than one truth property. I argue, however, that when their view is developed in this way it fails to satisfy realistic intuitions about morality. This shows that on a plausible and initially promising reading of what it takes for a normative entity to exist in a way that is different from non-normative entities, Parfit’s and Scanlon’s non-metaphysical moral realism fails to be more realistic than contemporary versions of anti-realism. (shrink)

Derek Parfit famously defends a number of surprising views about "fission." One is that, in such a scenario, it is indeterminate whether I have survived or not. Another is that the fission case shows that it does not matter, in itself, whether I survive or not. Most critics of the first view contend that fission makes me cease to exist. Most opponents of the second view contend that fission does not preserve everything that matters in ordinary survival. In this (...) paper I shall provide a critique that does not rely on either of these contentions. There are other, interrelated reasons to reject Parfit's defense of the two theses. In particular, the availability of the following view creates trouble for Parfit: I determinately survive fission, but it is indeterminate which fission product I am. (shrink)

Parfit has argued for the revolutionary thesis that personal identity does not matter in ordinary survival, only the R-relation does. “Reconciliationists,” such as Lewis, have tried to stop this revolution, arguing that both personal identity and the R-relation matter. The disagreement has been between those who hold that only the R-relation matters and those who hold that, in addition, personal identity matters. But there is a third option. I argue that Parfit is right that personal identity does not (...) matter but he is wrong that the R-relation matters, and the reconciliationists are wrong to think both matter since neither does. (shrink)

Derek Parfit was one of the world’s leading philosophers. His _On What Matters_ was the most eagerly awaited book in philosophy for many years. _Reading Parfit: On What Matters _is an essential overview and assessment of volumes 1 and 2 of Parfit’s monumental work by a team of international contributors, and includes responses by Parfit himself. It discusses central features of Parfit’s book, including the structure and nature of reasons; the ideas underlying moral principles; (...) class='Hi'>Parfit’s discussions of consequentialism, contractualism and Kantian deontology; and his metaethical ideas and arguments. Reading Parfit will be central reading for students of ethics and anyone seeking a deeper understanding of one of the most important works of philosophy published in the last fifty years. (shrink)

Derek Parfit was one of the world’s leading philosophers. His _On What Matters_ was the most eagerly awaited book in philosophy for many years. _Reading Parfit: On What Matters _is an essential overview and assessment of volumes 1 and 2 of Parfit’s monumental work by a team of international contributors, and includes responses by Parfit himself. It discusses central features of Parfit’s book, including the structure and nature of reasons; the ideas underlying moral principles; (...) class='Hi'>Parfit’s discussions of consequentialism, contractualism and Kantian deontology; and his metaethical ideas and arguments. Reading Parfit will be central reading for students of ethics and anyone seeking a deeper understanding of one of the most important works of philosophy published in the last fifty years. (shrink)

Derek Parfit, in On What Matters, argues that all subjective accounts of normative reasons for action are false. This chapter focuses on his “Agony Argument.” The first premise of the Agony Argument is that we necessarily have current reasons to avoid our own future agony. Its second premise is that subjective accounts cannot vindicate this fact. So, the argument concludes, subjective accounts must be rejected. This chapter accepts the first premise of this argument and that it is valid. The (...) main thesis of this chapter is that subjectivists can account for our reasons to get pleasure and avoid agony. The chapter concludes that the Agony Argument does not justify the rejection of subjective accounts. The chapter also examines Parfit's understanding of the distinction between objective and subjective theories. The chapter claims Parfit offers a surprisingly narrow understanding of subjectivism such that even if his critique were successful, this would be bad news for fewer theories than we might have thought. Finally, the chapter replies to some possible worries about the arguments of this chapter. (shrink)

Parfit's most controversial claim about personal identity is that personal identity does not matter in the way we uncritically think it does) I would like to analyze Parfit's reasons for making this claim. These reasons are complex, and they stand in some tension with one another. I would like to examine them carefully and to try to arrive at the strongest case that can be made for Parfit's controversial claim about what matters.

I argue that Parfit's On What Matters does not make a compelling case against subjective accounts of reasons for action.

Derek Parfit's Reasons and Persons is a long, difficult and fascinating book, inside which three shorter, clearer and better books are struggling to get out. The third of these shorter but better books deals with the problem of Future Generations, and that is the book I want to discuss. In it Parfit tries, but fails, to find a theory—Theory X, he calls it—which will deal with various problems and issues which he develops, and in particular the issue which (...) I will call the Parfit Population Problem, the problem of how many people there ought to be. In this paper I offer not so much a theory as a suggestion as to what the solution might be. (shrink)

_ Reading Parfit _ brings together some of the most distinguished scholars in the field to discuss and critique Derek Parfit's outstanding work, _ Reasons and Persons, _.

Consider our attitude toward painful and pleasant experiences depending on when they occur. A striking but rarely discussed feature of our attitude which Derek Parfit has emphasized is that we strongly wish painful experiences to lie in our past and pleasant experiences to lie in our future. Our asymmetrical attitudes toward future and past pains and pleasures can be forcefully illustrated by means of a thought-experiment described by Parfit (1984, 165) which I will paraphrase as follows: You are (...) in the hospital to have an extremely painful but completely safe operation for which you can be given no anaesthetic. In order to ease recovery, you know that the hospital will give you drugs that cause you to forget your operation as soon as it is completed. You wake up, not remembering having gone to sleep, and ask the nurse if your operation has been completed. She tells you that there were two patients for this operation and she cannot remember which you are: either you already had your operation and it was the longest such operation ever performed, lasting ten hours, or else you are the other patient in which case your operation is imminent, but will last only one hour. 1. I wish to thank Sarah Broadie for comments on a version of this paper and Derek Parfit for conversations on this subject. (shrink)

One of Parfit’s arguments for the thesis that identity never matters involves generalizing from “divergence” cases in which identity arguably does not matter. The primary divergence case for Parfit is fission. According to Parfit’s assessment, it is not true that the fissioner gets what matters with respect to either fissionee by way of being identical to each fissionee but does so by way of the M-relation, psychological continuity with its normal cause, the persistence of enough of the (...) brain. The same is true in all other divergence cases by Parfit’s accounting. Parfit generalizes. From (E) Whenever M and identity diverged, it would be M that mattered, not identity. Parfit infers (F) Whenever M and identity diverge and even when these relations coincide, it is M that matters, not identity. In this paper, I challenge the inference from (E) to (F). (shrink)

In his work on personal identity, Derek Parfit makes two revolutionary claims: firstly, that personal identity is not what matters in survival; and secondly, that what does matter is relation R. In this article I demonstrate his position here to be inconsistent, with the former claim being defensible only in case the latter is false. Parfit intends his famous fission argument to establish the unimportance of identity – a conclusion disputed by, among others, Mark Johnston. My approach is (...) to critically assess their debate, focusing on Johnston's reductio of Parfit's position. I contend that although Parfit's own response fails, there are other ways to save the fission argument. The unimportance of identity then comes at a cost, however, because the reductio can only be avoided by accepting either that nothing matters in survival, or else that facts about particles and forces do. Either way, relation R cannot be what matters. (shrink)

In his recent work, Parfit returns to the examination of the non-identity problem, but this time not in the context of a theory of value but as part of a Scanlonian theory of reasons for action. His project is to find a middle ground between pure impersonalism and the narrow person-affecting view so as to do justice to some of our fundamental intuitions regarding procreative choices. The aim of this article is to show that despite the sophisticated and challenging (...) thought experiments and conceptual suggestions , Parfit’s project fails and that we are left with the stark choice between personalism and impersonalism. (shrink)

This paper aims to establish that Sorites reasoning, a fundamental part of Parfit's work, is more destructive that he intends. I establish the form that Parfit's arguments take and then substitute premises whose acceptability to Parfit I show. The new argument demonstrates an eliminativism or immaterialism concerning persons which Parfit must find repugnant.

I argue that rule consequentialism sometimes requires us to act in ways that we lack sufficient reason to act. And this presents a dilemma for Parfit. Either Parfit should concede that we should reject rule consequentialism (and, hence, Triple Theory, which implies it) despite the putatively strong reasons that he believes we have for accepting the view or he should deny that morality has the importance he attributes to it. For if morality is such that we sometimes have (...) decisive reason to act wrongly, then what we should be concerned with, practically speaking, is not with the morality of our actions, but with whether our actions are supported by sufficient reasons. We could, then, for all intents and purposes just ignore morality and focus on what we have sufficient reason to do, all things considered. So if my arguments are cogent, they show that Parfit’s Triple Theory is either false or relatively unimportant in that we can, for all intents and purposes, simply ignore its requirements and just do whatever it is that we have sufficient reason to do, all things considered. (shrink)

Nach Parfit konvergieren die systematisch stärksten Versionen von Kantianismus, Regel-Konsequentialismus und Kontraktualismus in einer Triple Theory. Ich konzentriere mich auf eine der zentralen Schwierigkeiten, Kantianismus und Konsequentialismus zusammenzubringen: die Rolle von Zustimmung, welche ihren deutlichsten Ausdruck in Kants Zweck-an-sich-Formel findet. Ich zeige zunächst, wie die Einführung unparteilicher, nichtmoralischer Gründe, auf der viel Gewicht in Parfits Zustimmungsprinzip liegt, in einigen Fällen die Zweck-an-sich-Formel zu dem intuitiv richtigen Ergebnis führen kann. Anschließend wende ich mich kritisch gegen Parfit. Ich diskutiere zwei (...) Einwände gegen Parfits Zustimmungsprinzip: Das Zustimmungsprinzip ist unterbestimmt und daher nicht relevant für die Fälle, die Kantianismus und Konsequentialismus unterscheiden. Zudem lässt das Zustimmungsprinzip, wie Parfit es versteht, mehr Instrumentalisierung zu, als Parfit selbst bereit ist einzuräumen. (shrink)

In the brilliant final section of Reasons and Persons , Derek Parfit presents a puzzle about how the goodness of states of affairs relates to the quality of the lives led by people in those states. Stripped to barest essentials, the puzzle runs as follows: if the value of a state is obtained simply by aggregating the quantity of whatever makes life worth living, then a world in which a significant number of people (say ten billion) enjoy lives of (...) very high quality would be inferior to a world in which a vastly greater number of people have lives that are barely worth living (the.. (shrink)

In the posthumously published ‘Future People, the Non-Identity Problem, and Person-Affecting Principles’, Derek Parfit presents a novel axiological principle which he calls the Wide Dual Person-Affecting Principle and claims that it does not imply the Repugnant Conclusion. This paper shows that even the best version of Parfit's principle cannot avoid this conclusion. That said, accepting such a principle makes embracing the Repugnant Conclusion more justifiable. This paper further addresses important questions which Parfit left unanswered concerning: the relative (...) importance of individual and collective goodness, comparisons involving unequal outcomes, how to understand individual goodness, and whether incomparability at the level of individual goodness implies incomparability at the level of overall goodness. (shrink)

Derek Parfit (1942–2017) is widely considered to be one of the most important moral philosophers of the twentieth century. Reasons and Persons is arguably the most influential of the two books published in his lifetime and hailed as a classic work of ethics and personal identity. Derek Parfit’s Reasons and Persons: An Introduction and Critical Inquiry is an outstanding introduction to and assessment of Parfit’s book, with chapters by leading scholars of ethics, metaphysics and of Parfit’s (...) work. Part I provides a much-needed introduction to key topics and themes in Reasons and Persons that will be useful for those new to Parfit’s complex work. These include Parfit’s idea of self-defeating theories, rationality and time, personal identity, future generations and well-being. Part II explores various debates generated by Reasons and Persons, including its connections with Buddhism, metaethics, theory of rationality, transformative choices and further developments in personal identity and metaphysics such as conativism. Combining clear exposition of the major topics and arguments in Reasons and Persons with scholarly perspectives on more advanced themes, this book is ideal for students of ethics, metaethics, metaphysics and anyone interested in Derek Parfit’s philosophy. (shrink)

Parfit (2017) proposed a novel principle for outcome betterness in different people and different number choices. It is claimed to solve the Non-Identity Problem while avoiding the Repugnant Conclusion, and it shall do so in person-affecting rather than in impersonal terms. According to this Wide Dual Person-Affecting Principle, one of two outcomes would be (i) in one way better if this outcome would together benefit people more, and (ii) in another way better if this outcome would benefit each person (...) more. I argue that a plausible construal of this principle has two features that make it vulnerable to objections. First, the most plausible interpretation of the second part of the principle turns out to incorporate an average function. Although this helps to avoid the Repugnant Conclusion, it implausibly implies that it can be better to add further people with less bad but still miserable lives to populations consisting only of lives full of suffering. Second, the principle is not based on a comparative but on an intrinsic notion of benefit. This allows to solve the Non-Identity Problem, yet it accounts only for a weak sense of person-affecting rather than for the more substantive person-affecting intuition that it is morally significant that particular people are made better (or worse) off. Eventually, I highlight what we can, nevertheless, learn from Parfit’s idea of combining different ways in which outcomes might be better. (shrink)

Derek Parfit claims that we are not human beings. Rather, each of us is the part of a human being that thinks in the strictest sense. This is said to solve a number of difficult metaphysical problems. I argue that the view has metaphysical problems of its own, and is inconsistent with any psychological-continuity account of personal identity over time, including Parfit's own.

Figure majeure de la philosophie morale, Derek Parfit (1942-2017) reste encore peuconnu en France. Cette introduction vise à montrer l'ampleur des thématiques abordées de Parfit en les rattachant au projet d'une éthique rationnelle, tandis que le numéro dansson ensemble, sans prétendre être exhaustif, propose des présentations et discussions de différents éléments clefs de sa philosophie.

Quassim Cassam; II*—Parfit on Persons, Proceedings of the Aristotelian Society, Volume 93, Issue 1, 1 June 1993, Pages 17–38, https://doi.org/10.1093/aristoteli.

Like many others interested in Derek Parfit’s work, I’ve been awaiting this collection of original essays on Reasons and Persons, having placed an order with my bookstore at least a year before the book was finally published. The delay was due to the editor’s original plan of including Parfit’s responses, a plan that had to be abandoned. Eventually, Jonathan Dancy tells us, Parfit will publish responses to these pieces. And at least one response has already appeared in (...) print, Parfit’s discussion of Mark Johnston’s contribution to the—then forthcoming—Dancy volume. So the bad news is that all of these essays were in their completed form five or six years before the book was published; as a result, the arguments sometimes seem a little bit familiar and, of course, neither profit from nor engage the most recent literature on the topics they address. (shrink)

In On What Matters verbindet Parfit einen nicht-naturalistischen normativen Realismus –die Auffassung, es gebe objektive normative Wahrheiten – mit einer intuitionistischen Erkenntnistheorie bezüglich des Normativen, die davon ausgeht, wir hätten intuitiven epistemischen Zugriff auf jene normativen Wahrheiten. Beide Theorien sieht er durch ein Argument bedroht, das von moralischer Uneinigkeit ausgeht. Um diesem Argument zu entgehen, vertritt Parfit die These, dass unsere normativen Überzeugungen unter Idealbedingungen konvergieren. Dieser Aufsatz macht anhand des Beispiels meta-normativer Uneinigkeiten zunächst deutlich, dass Parfit (...) die Plausibilität seiner Konvergenzthese überschätzt. Es bestehen jedoch – so der konstruktive Vorschlag – Möglichkeiten, Realismus und Intuitionismus zu verbinden, ohne sich auf die Konvergenzthese festzulegen. (shrink)

Derek Parfit argues that everyone ought to follow the principles whose universal acceptance would make things go best. I present a counterexample: a world in which no one's moral beliefs have any motivating force. I explain how Parfit's metaethical commitments imply that such a world is possible, and why this possibility is a problem for Parfit's project of reconciling Kantianism, contractualism, and consequentialism. I consider two of Parfit's responses to my counterexample.

In the paper I offer some criticisms on Parfitian account of personal identity. Firstly, I show that his view amounts to a position, wich I call 'nihilism', the view, that persons do not exist. Secondly, I argue that his account of personal identity is not consistent with the classical view of identity that Parfit seems to accept.

Theoria, EarlyView. Henry Pollock, in “Parfit's Fission Dilemma: Why Relation R Doesn't Matter”, examines the options available to Parfit for defending his “argument from below” from Johnstonʼs reductio objection. Pollock argues that Parfitʼs proposed defence against Johnston fails. In this article, I argue that Pollockʼs objections to Parfitʼs defence can be resisted.

파핏은 최근 저서에서 도덕적 속성을 포함한 규범적 속성이 그 어떤 자연적 속성과 동일시될 수 없다는 비자연주의를 옹호한다. 논문은 자연주의에 반대하는 파핏의 두 논증을 비판적으로 검토하는데, 첫째 논증은 자연주의가 채택된다면 어떤 자연적 속성을 가진 행위가 옳거나 그르다는 규범적 명제들이 사소하게 참이 되어 실질적 의미를 상실한다고 주장하고, 둘째 논증에 의하면 자연주의적 환원은 규범성의 독특하고 고유한 특징을 포섭하지 못한다. 논문은 규범을 자연적 속성과 동일시하면서도 의미있는 규범적 명제들이 가능한 방식, 그리고 파핏의 규범성의 이념의 중심인 행위이유에 대한 자연주의적 환원의 모델을 제시한다. 그리고 규범윤리학과 메타윤리학을 포함한 (...) 파핏의 전반적 구도내에 존재하는 긴장들을 제시한다. (shrink)

The paper takes a close look at Derek Parfit’s example of the Nineteenth Century Russian in 'Reasons and Persons'. Parfit presents it as an example which illustrates the moral consequences of adopting his reductionist view of personal identity in a positive light. I argue that things turn out to be more complex than he envisages, and that it might be far more difficult to live in his world than he allows.

Parfit’s well known book, Reasons and Persons, argues, among other things, that ‘what matters’ in regard to ‘survival’ is not personal identity but something he calls ‘relation R.’ On this basis, plus other considerations, he rejects the ‘Self-interest’ theory as to what should be our aim in life. Here I show, or try to show, that his over-all argument is seriously defective. In particular, he fails to prove that personal identity is not what matters for survival.

In the first two volumes of On What Matters, Derek Parfit argues that three major normative theories – Kantianism, Contractualism and Rule Consequentialism – are, in their most defensible forms, compatible, and can be reconciled in what he calls ‘Triple Theory’. This has led many to assume that Parfit does not believe that Act Consequentialism is a defensible form of Consequentialism. We draw on correspondence with Parfit to show that this assumption is incorrect. We then consider (...) class='Hi'>Parfit's efforts, in the third volume of On What Matters, to narrow the differences between Act Consequentialism and the triple theory, in part by treating impartial rationality as an external rival to morality, in much the same way that egoism is an external rival to morality. We argue that Parfit's attempts to bridge the gap between Act Consequentialism and Triple Theory meet with only limited success. (shrink)

In his recent monumental book On What Matters, Derek Parfit argues for a hard determinist view that rejects free will-based moral responsibility and desert. This rejection of desert is necessary for his main aim in the book, the overall reconciliation of normative ethics. In Appendix E of his book, however, Parfit claims that it is possible to mete out fair punishment. Parfit’s position on punishment here seems to be inconsistent with his hard determinism. I argue that (...) class='Hi'>Parfit is mistaken here, in a way that leads him to unjustified optimism about the possibility of fair penalization. Insofar as we take the free will problem seriously, we cannot reconcile a belief in the absence of desert with a belief in the fairness of penalization. (shrink)

In his book On What Matters, Derek Parfit defends a version of moral non-naturalism, a view according to which there are objective normative truths, some of which are moral truths, and we have a reliable way of discovering them. These moral truths do not exist, however, as parts of the natural universe nor in Plato’s heaven. While explaining in what way these truths exist and how we discover them, Parfit makes analogies between morality on the one hand, and (...) mathematics and logic on the other. Moral truths “exist” in a way that numbers exist, and we discover these truths in a similar way as we discover truths about numbers. By the end of the second volume, Parfit also responds to a powerful objection against his view, an objection based on the phenomenon of moral disagreement. If people widely and deeply disagree about what is the moral truth, it is doubtful whether we have a reliable way of discovering it. In his reply, he claims that in ideal conditions for thinking about moral questions, we would all have sufficiently similar moral beliefs. However, we often find ourselves in less-than-ideal conditions due to various factors that distort our ability to agree. Therefore, differences in moral opinion can be expected. In this paper, I draw a connection between these parts of Parfit’s theory and comment on them. Firstly, I argue that Parfit’s analogy with mathematics and logic and his answer to the disagreement objection are in tension because there are important epistemic differences between morality and these fields. If one would try to account for the differences, one would have to sacrifice some measure of similarity between morality and them. Secondly, I comment on Parfit’s reply to the disagreement objection itself. I believe that, although his description of ideal conditions has some potential for reaching moral agreement, it may be difficult to tell if ideal conditions prevail. This obscurity spells further trouble for Parfit’s overall theory. (shrink)

It is thought by some philosophers that certain arguments developed by Peter Strawson in Individuals show that Derek Parfit's claim in Reasons and Persons that experiences can be referred to without referring to persons is incoherent. In this paper I argue that Parfit's claim is not threatened by these arguments.

A vcry important question raised by Dcrck Parfit in the part 0i` Reasons and Persons which dcals with population ethics is how t0 compare thc future outcomes 0i` those policies which differ in thc way they afTcct population growth} Such comparisons arc complicated by the fact that thcsc 0utcomcs may differ not only in thc avcragc Icvcls 0f well-being they gcncratc but also in thc identity and number 0i` thc persons who cxist.

In his recent book, Reasons and Persons, Derek Parfit propounds a version of the psychological criterion of personal identity.1 According to the variant he adopts, the numerical identity through time of persons consists in non-branching psychological continuity no matter how it is caused. One traditional objection to a view of this sort is that it is circular, since psychological continuity presupposes personal identity. Although Parfit frequently denies the importance of personal identity, he considers his own psychological account of (...) identity important enough to attempt to defend it against the charge of circularity. The aim of this paper is to argue that Parfit's attempted defence is unsuccessful because it ultimately rests on an analysis of the unity of consciousness that is itself either circular or otherwise inadequate. (shrink)

The Non-Reductionist holds that personal identity is a matter in whole or in part of “further facts,” facts over and above those about psychological and physical continuity and connectedness. If Non-Reductionism is true, then it is possible for there to be “nonsymmetrical fission cases” in which there is nonsymmetry with respect to further facts such that the fissioner is identical with one of the fission products but not the other, even though there is symmetry along each branch with respect to (...) non-further facts. If it is also true that the fissioner gets what matters with respect to the fission product to which the fissioner is not identical in those cases, it is possible for identity and what matters to come apart. If the Non-Reductionist is to hold fast to the importance of identity, she must demonstrate that the fissioner does not get what matters in survival with respect to the fission product to which he is not identical in cases of nonsymmetrical fission. One way to get this result would be to demonstrate that Non-Reductionism in and of itself has the implication that the fissioner does not get what matters with respect to the fission product to which he is not identical in the nonsymmetrical fission case. Parfit offers an argument that is meant to show that the Non-Reductionism qua Non-Reductionism has just this result. I outline Parfit’s argument and suggest that it does not work. (shrink)

This paper presents a Davidsonian perspective on Derek Parfit’s disagreements with Nietzsche. I have actually gone further, too far perhaps, and tried to imitate Davidson’s attractive essayistic style.

Though consequentialist theories of political obligation have been widely criticized in recent years, a series of arguments presented by Derek Parfit, in Reasons and Persons, are now believed to have given this position new life.