i WHAT DO PHILOSOPHERS DO? ii THE ROMANELL LECTURES The Romanell- Phi Beta Kappa Professorship, first awarded in 1983, was established by an endowment from Patrick and Edna Romanell. Patrick Romanell, a Phi Beta Kappa member from Brooklyn College, was H. Y. Benedict Professor of Philosophy at the University of Texas, El Paso. The Phi Beta Kappa Society administers the Professorship, which takes the form of three lectures given each year by a distinguished philosopher, at his or her home institution, on a topic important to an audience beyond professional philosophers. This intent of this series is to publish the results of those lec- tures in affordable and accessible editions. Published in the Series What Do Philosophers Do? Skepticism and the Practice of Philosophy Penelope Maddy iii WHAT DO PHILOSOPHERS DO? Skepticism and the Practice of Philosophy Penelope Maddy 1 iv 1 Oxford University Press is a department of the University of Oxford. It furthers the University’s objective of excellence in research, scholarship, and education by publishing worldwide. Oxford is a registered trade mark of Oxford University Press in the UK and certain other countries. Published in the United States of America by Oxford University Press 198 Madison Avenue, New York, NY 10016, United States of America. © Penelope Maddy 2017 All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, without the prior permission in writing of Oxford University Press, or as expressly permitted by law, by license, or under terms agreed with the appropriate reproduction rights organization. Inquiries concerning reproduction outside the scope of the above should be sent to the Rights Department, Oxford University Press, at the address above. You must not circulate this work in any other form and you must impose this same condition on any acquirer. CIP data is on file at the Library of Congress ISBN 978–0 –1 9–0 61869–8 1 3 5 7 9 8 6 4 2 Printed by Sheridan Books, Inc., United States of America v For J. S. P. spinner of make- believe vi vii CONTENTS Preface ix Introduction 1 I. The Dream Argument 7 1. Descartes on dreaming 7 2. Stroud on dreaming 18 3. Stroud versus Austin 40 II. The Argument from Illusion 73 1. The argument 74 2. Shortcomings of the argument 92 3. Why is the argument so appealing? 109 4. From the argument to skepticism 141 5. Back to dreaming 150 viii Contents III. The Cure and Beyond 157 1. Moore 158 2. Wittgenstein 176 3. Beyond 201 Appendix A: The Infinite Regress of Justification 221 Appendix B: The Closure Argument 229 Bibliography 235 Index 245 viii ix PREFACE This book is an attempt to knit together two themes: an investi- gation of the arguments for radical skepticism about our knowl- edge of the external world, and an examination of the merits and interrelations of various ways of doing philosophy. The two skep- tical arguments that receive the most attention are the Dream Argument and the Argument from Illusion; for completeness, the Infinite Regress of Justification and the Closure Argument are touched on in two short appendices. The methods consid- ered are Commonsense Philosophy, in the person of the Plain Man; Naturalism, in the person of the Plain Inquirer (known in [2007], [2011], and [2014] as the Second Philosopher); Conceptual Analysis; Ordinary Language Philosophy (as prac- ticed by J. L. Austin); and Therapeutic Philosophy (as practiced in different ways by Austin and Ludwig Wittgenstein). Though
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