An inviting alternative to traditional texts in introductory logic, The Art of Reasoning is widely acclaimed for its conversational tone and accessible exposition of rigorous logical concepts.

This book is a defense of modal realism; the thesis that our world is but one of a plurality of worlds, and that the individuals that inhabit our world are only a few out of all the inhabitants of all the worlds. Lewis argues that the philosophical utility of modal realism is a good reason for believing that it is true.

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: Descartes' conceptual distinction (or distinctio rationis) is commonly understood to be a distinction created by the mind's activity without a foundation in re. This paper challenges this understanding partially based on a letter to an unknown correspondent in which Descartes claims not to admit distinctions without a foundation. He goes on to claim that his conceptual distinction is not a distinctio rationis ratiocinantis (i.e. a distinction of reasoning reason) but is something like a formal distinction or, more precisely, a (...) distinctio ! rationis ratiocinatae (i.e. a distinction of reasoned reason). This remark is then explored through Descartes' other writings and his scholastic intellectual heritage. I conclude that Descartes' conceptual distinction just is a formal distinction understood as a distinctio rationis ratiocinatae as expressed in the works of Scotus, Suarez and Eustachius, and so it has a foundation in re in very much the same way as a formal distinction. (shrink)

This paper explores the ontology of Malebranche's notion of "intelligible extension", the archetypal divine idea of matter which he believed to be the immediate object of our own minds in all of our thoughts about corporeal things. Building on this account of its ontology, and through an examination of a form of isomorphism between intelligible extension and the created spatial world, the paper also attempts to explain the manner in which it could fulfill its epistemological role of representing all possible (...) bodies and supplying us with our abstract knowledge of geometry. (shrink)

Of Malebranche's many famous doctrines, his “Vision in God” (VIG) surely ranks among the most interesting. Inspired by Augustine and Descartes, he argues for it vigorously and gives it a prominent place in his system of thought. And although it won no converts it did win many critics, who, in criticizing, were compelled to clarify their own theories of cognition. Thus VIG is of interest for its own sake, for its role in Malebranche's philosophy, and for its general influence in (...) the early modern period. (shrink)

Nicolas Malebranche holds that we see all things in the physical world by means of ideas in God (the doctrine of "vision in God"). In some writings he seems to posit ideas of particular bodies in God, but when pressed by critics he insists that there is only one general idea of extension, which he calls “intelligible extension.” But how can this general and “pure” idea represent particular sensible objects? I develop systematic solutions to this and two other putative difficulties (...) with Malebranche’s theory of sensory cognition by appealing to the notion of “seeing as” and to his doctrine that ideas in God have causal powers to affect the mind. (shrink)

Berkeley, Malebranche, and Vision in God NICHOLAS JOLLEY IN THE SECOND of the Three Dialogues Hylas, the materialist, asks Philonous: "But what say you, are not you too of opinion that we see all things in God? If I mistake not, what you advance comes near it."' In the first edition of the Dialogues Philonous's response was a temperate one; he expressed his agree- ment with Malebranche's emphasis on the Scriptural text that in God we live, move, and have our (...) being, and confined his disagreement with Malebranche to pointing out that, for him, the things we perceive are our own ideas. In the third edition, by contrast, Berkeley inserted a lengthy and rather ill-tempered expression of his differences from Malebranche: Few men think, yet all will have opinions. Hence men's opinions are superficial and confused. It is nothing strange that tenets, which in themselves are ever so different, should nevertheless be confounded with each other by those who do not consider them attentively. I shall not therefore be surprised, if some men imagine that I run into the enthusiasm of Malebranche, though in truth I am very remote from it. He builds on the most abstract general ideas, which I entirely disclaim. He asserts an absolute exter- nal world, which I deny. He maintains that we are deceived by our senses, and know not the real natures or the true forms and figures of extended beings; of all which I hold the direct contrary. So that upon the whole there are no. (shrink)

In the first part of this paper I explore the relations among distinctness, separability, number, and non-identity. I argue that Descartes believes plurality in things themselves arises from distinction, so that things distinct in any of the three ways are not identical. The only exception concerns universals which, considered in things themselves, are identical to particulars. I also argue that to be distinct is to be separable. Things distinct by reason are separable only in thought by means of ideas not (...) clear and distinct. In the second part I argue that the notion of separability in Descartes’s account of real distinction between mind and body is subject to five different interpretations. I claim that the heart of Cartesian dualism concerns the separability of the attributes thought and extension. It does not require that mind and body are separable in the sense that each can exist without the other existing. (shrink)

According to David Lewis, a realist about possible worlds must hold that actuality is relative: the worlds are ontologically all on a par; the actual and the merely possible differ, not absolutely, but in how they relate to us. Call this 'Lewisian realism'. The alternative, 'Leibnizian realism', holds that actuality is an absolute property that marks a distinction in ontological status. Lewis presents two arguments against Leibnizian realism. First, he argues that the Leibnizian realist cannot account for the contingency of (...) actuality. Second, he argues that the Leibnizian realist cannot explain why skepticism about one's own actuality is absurd. In this paper, I mount a defense of Leibnizian realism. (shrink)

EDITOR'S INTRODUCTION T JLJe1bn1z was above all things a metaphysician. That does not mean that his head was in the clouds, or that the particular sciences ...

The philosophy of Malebranche is a speculative system of great intellectual interest. A comprehensive examination of it, however concise, is therefore a major undertaking. In this paper I shall limit myself to three points. I shall examine, partly from within and partly from without, Malebranche's account of perception as it relates to the realism-nominalism problem; I shall inquire what, if anything, he has to say about the related problem of individuation; and I shall analyze some aspects of the vision in (...) God. These three topics will be taken up, in this order, in Sections Three, Four, and Five. The first two sections provide background. Section One deals, most concisely yet in an analytical fashion, with the realism issue. Section Two digests, in the same manner, what I shall need of Malebranche's system. Section Six contains some concluding remarks. (shrink)

The aim of philosophy, abstractly formulated, is to understand how things in the broadest possible sense of the term hang together in the broadest possible sense of the term. Under 'things in the broadest possible sense' I include such radically different items as not only 'cabbages and kings', but numbers and duties, possibilities and finger snaps, aesthetic experience and death. To achieve success in philosophy would be, to use a contemporary turn of phrase, to 'know one's way around' with respect (...) to all these things, not in that unreflective way in which the centipede of the story knew its way around before it faced the question, 'how do I walk?', but in that reflective way which means that no intellectual holds are barred. (shrink)