LEARNING FROM SIX PHILOSOPHERS This page intentionally left blank Learning from Six Philosophers Descartes, Spinoza, Leibniz, Locke, Berkeley, Hume JONATHAN BENNETT VOLUME 2 CLARENDON PRESS · OXFORD 2001 1 Great Clarendon Street, Oxford Oxford University Press is a department of the University of Oxford. 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Padstow, Cornwal Preface to Volume 2 This second half of my two-volume work is mainly concerned with themes in the philosophies of Locke, Berkeley, and Hume, though Leibniz will appear as a commentator on Locke and (in Chapters 23 and 40) in other ways as well. Chapter 24 expounds a theory of Descartes’s which I prefer to treat only after presenting related work by Locke and Leibniz. Fifteen of the chapters in this volume (the exceptions being 23, 24, and 38–40) overlap my Locke, Berkeley, Hume: Central Themes(1971) in the topics covered and, to a considerable extent, in what I have to say about them. Except in Chapter 37, however, hardly a sentence has been carried over intact from the earlier book, and what I now offer reflects the intervening three decades of further reading and reflection and of growth as a philosopher. I respond to some criticisms of my earlier work, where it seems profitable to do so. But my main concern is to present what I now have to say in as clear and uncluttered a manner as possible. Each volume contains the Contents and Abbreviations for the entire work. The Bibliography and Indexes have been divided, with each volume containing only what is relevant to it. Each Index of Topics includes references to the ‘six philosophers’; all other personal references are in the Index of Persons. A comprehensive treatment of my six philosophers, even on the topics within their work which I discuss, could not be achieved by one person or presented in a mere forty chapters. I have chosen topics which I find interesting and nourish- ing to wrestle with. A reader who stays with me will at the end have some sense of the overall shape of each of the six, though providing this has not been my chief aim. The title Learning from Six Philosophersdeclares my attitude in this work: I want to learn from these men, which I do by arguing with them. I explain and defend this approach in the Introduction to Volume 1. This work arises out of teaching across forty years at several universities— Cambridge, Cornell, Michigan, Princeton, British Columbia, Syracuse. My intel- lectual debts to colleagues and students at those institutions are too numerous, and not clearly enough remembered, for me to acknowledge them in detail; but I place on record my gratitude for the doctoral programme at Syracuse University, and for my eighteen happy years of contact with its students and faculty. I was also helped by sabbatical leaves in which I was supported by Syracuse University and (in two) by the National Endowment for the Humanities and (in a third) by the John Simon Guggenheim Foundation. To all three organizations I am grateful. vi PREFACE TO VOLUME 2 At a late stage in its life, the entire manuscript was read for the Oxford University Press by Don Garrett, who provided several dozen comments and suggestions for its improvement. I have availed myself of many of these, and thank Garrett for the generosity and thoughtfulness of his help. Readers who have comments, suggestions, or corrections to offer are invited to send them to me at [email protected]. J.F.B. Bowen Island, BC May 2000 Contents VOLUME 1 Abbreviations xvii INTRODUCTION 1 CHAPTER 1: CARTESIAN AND ARISTOTELIAN PHYSICS 11 1. Aristotelian physics: a quick sketch 11 2. Aristotle and Descartes: how many fundamental kinds? 13 3. Aristotle and Descartes: four more differences 15 4. Aristotle and Descartes: teleology 17 5. Descartes and two predecessors 18 6. Aristotle, Descartes and the manifest image 21 CHAPTER 2: MATTER AND SPACE 23 7. ‘Material = extended’: why Descartes wanted this doctrine 23 8. ‘Material = extended’: how Descartes defended this 28 9. Solidity 30 10. Space as extended nothing 32 11. Container space 33 12. Spaces and places 35 13. Space as a system of relations 38 14. The fourth view: space as a separator 39 15. Descartes’s ‘neighbour’ account of motion 41 CHAPTER 3: DESCARTES’S PHYSICS 44 16. Smallness of parts 44 17. Subtleness and speed 46 18. Qualitative variety 48 19. Compression 51 20. The integration problem 53 21. Light and movement loops 55 22. Other work for loop theory 57 23. Traction 59 24. Weight 61 25. Was Descartes a ‘new Stoic’? 63 CHAPTER 4: DESCARTES’S DUALISMS 66 26. Property-dualism 66 viii CONTENTS 27. The indivisibility argument for the ‘real distinction’ 67 28. ‘I am unable to distinguish parts in myself’ 69 29. From conception to possibility 71 30. From possibility to actuality: essences 74 31. From possibility to actuality: individual identity 77 32. The Cartesian concept of man 81 CHAPTER 5: DESCARTES ON CAUSATION 84 33. Causation and similarity 84 34. Varying the causal resources principle 86 35. Tropes 90 36. Descartes against tropes 93 37. Descartes’s non-endurance doctrine 95 38. Body on body 99 39. Mind on body 101 40. Psychology’s invasion of physics 103 41. Body on mind: sense perception 105 42. Mind on mind 107 CHAPTER 6: PREPARING TO APPROACH SPINOZA 112 43. How to read the Ethics 112 44. Spinoza’s dualism 113 45. Spinoza’s monism 117 46. Spinoza’s pantheism 119 47. Spinoza’s a priori argument for God’s existence 122 48. Mind-body parallelism 124 49. Descartes’s robot 128 50. ‘A queer kind of medium’ 130 CHAPTER 7: ONE EXTENDED SUBSTANCE 133 51. The thing thought and the independence thought 133 52. Can a Cartesian body be annihilated? 135 53. Spinoza sees the problem 138 54. Spinoza’s solution and Curley’s challenge 140 55. Spinoza on bodies as modes 142 56. Objections by Curley 145 57. Spinoza’s two levels 147 58. Bodies and motion 148 CHAPTER 8: EXPLAINING THE PARALLELISM 151 59. ‘Idea of’ in Spinoza 151 60. The official arguments for parallelism 153 61. The thing-identity thesis: explaining parallelism 155 62. Trans-attributes qualities 158 63. A difficulty and a suggested solution 159 64. Five problems solved 162 CONTENTS ix 65. A further problem solved: attribute and essence 163 66. Intellectual limitations? 165 67. Expressing 167 CHAPTER 9: EXPLANATORY RATIONALISM 170 68. Causal laws in Spinoza 170 69. Time and eternity 172 70. Is this the only possible world? 173 71. Leibniz’s pursuit of contingency 176 72. Choices, especially God’s 182 CHAPTER 10: SPINOZA ON BELIEF AND ERROR 186 73. Beliefs 186 74. Belief and the will 189 75. Error 190 76. A better account of truth? 193 77. A suggested explanation 195 78. Adequate ideas 198 79. Mutilation 199 80. Confusion 201 81. Spinoza on reason’s infallibility 203 CHAPTER 11: DESIRE IN DESCARTES AND SPINOZA 207 82. Descartes on desire 207 83. Does Spinoza reject all teleology? 209 84. Spinoza’s trouble with thoughtful teleology 210 85. Spinoza’s account of appetite 214 86. The ‘demonstration’ of the conatusdoctrine 217 CHAPTER 12: LEIBNIZ ARRIVES AT MONADS 224 87. Why there are no material substances 224 88. Why there are immaterial substances 227 89. How bodies relate to monads 229 90. Divisibility and substances: some options 232 91. Why monads are mind-like 234 92. An aside on Leibniz’s gradualism 236 93. Further evidence that monads are mind-like 237 CHAPTER 13: CAUSATION AND PERCEPTION IN LEIBNIZ 240 94. The rejection of inter-substance causation 240 95. Leibniz against occasionalism 242 96. God’s conservation of his creatures 244 97. How monads develop 246 98. Perception: the account 247 99. Bottom-up versus top-down 249