Heather Dyke

The debate about the reality of tense descends from an argument of McTaggart's,whichwas designed to prove the unreality of time.The argument has two constituent theses: firstly that time is intrinsically tensed, and secondly, that the notion of tense is inherently self-contradictory. If both of these theses are true, it follows that time does not exist. The debate that has emerged from this argument centres around the truth or falsity of each of these theses. A-theorists accept the first and reject the second thesis, drawing the conclusion that, since there is no contradiction in the notion of tense, time exists and is intrinsically tensed. B-theorists accept the second and reject the first thesis, concluding that the notion of tense is inherently self-contradictory, but since time is not intrinsically tensed, time exists and is tenseless. I think the argument against tense is sound, but time is not intrinsically tensed, so time exists and is tenseless. However, this argument, which has come to be known as McTaggart's paradox, is obscure, which has tended to blunt its force. In this paper I recast McTaggart's paradox in my own terms. The notion of tense has two components: an observer-independent distinction between past, present and future, and a flow of time. Totake tense seriously is to suppose that these two features of tense are also features of time. I argue that they are inherently incompatible with each other, generating a contradiction at the heart of the notion of tense, thus proving that tense is unreal. The contradiction arises no matter how one construes the notion of tense, and I illustrate this by revealing essentially the same contradiction in a number of different accounts of tensed time.

A common approach in the Philosophy of Time, particularly in enquiry into the metaphysical nature of time, has been to examine various aspects of the nature of human temporal experience, and ask what, if anything, can be discerned from this about the nature of time itself. Many human traits have explanations that reside in facts about our evolutionary history. We ask whether features of human temporal experience might admit of such evolutionary explanations. We then consider the implications of any proposed evolutionary explanations for the veridicality of these experiences, and for the truth-value of folk beliefs about time that are based on them.

It sometimes happens that advances in one area of philosophy can be applied to a quite different area of philosophy, and that the result is an unexpected significant advance. I think that this is true of the philosophy of time and meta-ethics. Developments in the philosophy of time have led to a new understanding of the relation between semantics and metaphysics. Applying these insights to the field of meta-ethics, I will argue, can suggest a new position with respect to moral discourse and moral reality. This new position retains the advantages of theories like moral realism and naturalism, yet is immune to many of their difficulties.

In response to a recent challenge that the New B-theory of Time argues invalidly from the claim that tensed sentences have tenseless truth conditions to the conclusion that temporal reality is tenseless, I argue that while early B-theorists may have relied on some such inference, New B-theorists do not. Giving tenseless truth conditions for tensed sentences is not intended to prove that temporal reality is tenseless. Rather, it is intended to undermine the A-theorist’s move from claims about the irreducibility of tensed language to the conclusion that temporal reality must be tensed. I then examine how A-theorists have used facts about language in attempting to establish their conclusions about the nature of temporal reality. I take the recent work of William Lane Craig and argue that he implicitly and illicitly moves from facts about temporal language to his conclusion that temporal reality is tensed.

There are ways in which the new tenseless theory of time is analogous to David Lewis’s modal realism. The new tenseless theory gives an indexical analysis of temporal terms such as ‘now’, while Lewis gives and indexical analysis of ‘actual’. For the new tenseless theory, all times are equally real; for Lewis, all worlds are equally real. In this paper I investigate this apparent analogy between these two theories, and ask whether a proponent of one is committed, by parity of reasoning, to the other. I conclude that the analogy is merely apparent, and that independent reasons are needed to support each theory.

There are two extant versions of the new tenseless theory of time: the date versionand the token-reflexive version. I ask whether they are equivalent, and if not, whichof them is to be preferred. I argue that they are not equivalent, that the date version isunsatisfactory, and that the token-reflexive version is correct. I defend the token-reflexive version against a string of objections from Quentin Smith. My defence involves a discussion of the ontological and semantic significance of truth conditions, and of the connection between truth and reality on the one hand, and that between truth and meaning on the other. I argue that Smith's objections to the token-reflexive theory stem from his confusing these two aspects of the notion of truth.

Questions about the nature of truth are as old as philosophy itself. What is truth? On the one hand, it seems obvious that it is something that applies to the things we think and say. Many of our beliefs about the world, and sentences describing it are true. On the other hand, it seems intimately connected with the world we think and speak about, for it is in virtue of the way the world is that our sentences and beliefs about it are true. This book explores the notions of truth, reality, and the many connections between them.

The title of John Heil’s book From an Ontological Point of View is, of course, an adaptation of the title of Quine’s influential collection of essays From a Logical Point of View, published fifty years earlier in 1953. Quine’s book marked the beginning of a sea change in philosophy, away from ordinary language, armchair philosophising involving introspective examination of concepts, towards a more rigorous, analytical and scientific approach to answering philosophical questions. Heil’s book will, I think, mark the beginning of another sea change in philosophy, this time, away from a focus on language, and towards a focus on ontology. For that reason, the replacement of ‘Logical’ with ‘Ontological’ in Heil’s title is apposite. This is not to deny that Quine, and analytic philosophy in his wake, was interested in ontology. Some of the most fundamental philosophical questions that have vexed philosophers in the last fifty years are ontological questions: Are there numbers? Are there properties? Are there events? And if there are any of these kinds of things, what is their nature? But post-Quinean philosophers often set about answering these questions by looking at the language we use when we talk about numbers, properties and events. For example, philosophers engaged in the debate between realists and nominalists about universals would ask whether talk of redness could be adequately paraphrased by talk of red things. If so, the nominalist concluded that we are not committed to the existence of universals. If not, the realist concluded that we cannot escape commitment to them. Heil recommends that we abandon this methodology, for it leads us up blind alleys and conceals more acceptable positions from us. We should instead turn our attention directly onto ontological matters.

If, as the new B-theory of time maintains, tensed sentences have tenseless truth conditions, it follows that it is possible for two sentence-tokens to have the sametruth conditions but different meanings. This conclusion forces a rethink of the traditional identification of truth conditions with meaning. There is an aspect of the meanings of tensed sentences that is not captured by their truth conditions, and that has so far eluded explanation. In this paper I intend to locate, examine, and explain this feature of tensed meaning.

I argue that there is an inherent tension in the notion of a proposition that gives us reason to doubt that there can be any single entity that plays all the roles and possesses all the features normally attributed to propositions. The tension is that some of the roles and features of propositions require them to be essentially representational, while others require them to be non-representational. I first present what I call the standard view of propositions: a series of theses outlining the roles they are normally thought to play and the features they are normally thought to possess. I then highlight a number of tensions inherent in the standard view. I illustrate how this very tension creates problems for some realist theories of propositions. I discuss the distinction between the truth of a proposition and its existence, and argue that paying heed to this distinction allows us to identify, and clear up, a particular confusion that leads us to posit propositions in the first place. Finally, I consider where a rejection of propositions leaves us, ontologically and theoretically.

Ethics seeks answers to questions about the moral status of human actions and human lives. What should I do, and what should I not do? What sort of life should I lead? Actions and lives are temporal things. Actions are performed at certain times, are informed by past events and have consequences for the future. Lives have temporal extension, and are experienced from a sequence of temporal perspectives. Thus, one would think that answers to ethical questions should take account some of their temporal features. Yet there has never been a systematic study of the relations between time and ethics. In 2001 a conference was held at the University of Otago in New Zealand on the theme of Time and Ethics to explore issues that emerge at the intersection between these two fields of study. This volume contains revised versions of some of the papers presented at that conference. The essays are collected into three parts, each with its own unifying theme. Part I focuses on parallels between reasoning about time and reasoning about ethics, and shows various ways in which thinking about each of these fields can inform what we should say about the other. Part II looks at the ethical significance of temporal location. Actions, reasons, preferences, consequences, events, pains, persons and (arguably) the possession of a truth-value by a truth bearer, all have temporal location, and this fact turns out to have considerable ethical significance - or so the essays in this section argue. The essays in part III examine issues that arise out of the consideration that persons are both temporal and ethical beings. For instance, given that we typically continue to hold people responsible for their actions at times other than the times at which those actions are performed, we need an account of personal identity over time that can support this moral practice.

Ethics seeks answers to questions about the moral status of human actions and human lives. What should I do, and what should I not do? What sort of life should I lead? Actions and lives are temporal things. Actions are performed at certain times, are informed by past events and have consequences for the future. Lives have temporal extension, and are experienced from a sequence of temporal perspectives. Thus, one would think that answers to ethical questions should take account some of their temporal features. Yet there has never been a systematic study of the relations between time and ethics. In 2001 a conference was held at the University of Otago in New Zealand on the theme of Time and Ethics to explore issues that emerge at the intersection between these two fields of study. This volume contains revised versions of some of the papers presented at that conference.

I outline the debate in metaphysics between those who believe time is tensed and those who believe it is tenseless. I describe the terms in which this debate has been carried out, and the significance to it of ordinary tensed language and widespread common sense beliefs that time is tensed. I then outline a case for thinking that our intuitive beliefs about tense constitute an Adaptive Imaginary Representation (Wilson, in Biol Philos 5:37–62, 1990; Wilson, in Biol Philos 10:77–97, 1995). I also outline a case for thinking that our ordinary tensed beliefs and tensed language owe their tensed nature to its being adaptive to adopt a temporally self-locating perspective on reality. If these conclusions are right, then common sense intuitions and temporal language will be utterly misleading guides to the nature of temporal reality

If, as the new B-theory of time maintains, tensed sentences have tenseless truth conditions, it follows that it is possible for two sentence-tokens to have the sametruth conditions but different meanings. This conclusion forces a rethink of the traditional identification of truth conditions with meaning. There is an aspect of the meanings of tensed sentences that is not captured by their truth conditions, and that has so far eluded explanation. In this paper I intend to locate, examine, and explain this feature of tensed meaning.