René Descartes

Abstract: Contrary to received opinion, Descartes' view on the merits of the ontological proof may actually agree with that of Thomas Aquinas, whose rejection of the a priori existence proof has stocked the armories of anti-Anselmians ever since. In a rarely noted passage of the First Replies, Descartes claims not to differ in any respect from Thomas on the proof, a claim that gains sense in light of recent work on the Fifth Meditation. That work in turn reveals a well-founded, (...) if surprising, understanding of the Cartesian proof and of Cartesianism's true relation to Thomism. (shrink)

In the fifth of his Meditations on First Philosophy, Descartes offers a version of the ontological proof for the existence of God. As Caterus argues in the First Objections, however, it seems that if this argument were valid, then so also would be any number of absurd arguments, for insofar as Descartes infers that God exists from the fact that existence belongs to His essence, we should also be able to infer that other objects---the fictitious existing lion, say---exist on similar (...) grounds. Descartes's lone defense against this objection is to distinguish true and immutable essences from fictitious ones , a distinction that, in its details, seems to imply a realistic view of essences. Such a view of essences, though, conflicts with Descartes's explicit rejection of Platonism in the Principles of Philosophy , among other places. ;In this dissertation, I offer an interpretation of the Fifth Meditation that resolves this problem by treating true and immutable natures as nothing more than ideas, and I argue that, by a careful reading of several crucial yet rarely noticed texts, we can bring Descartes's cryptic and confusing Fifth Meditation claims under an anti-Platonic rubric. As an upshot of this interpretation, I propose an unusual reading of Descartes's ontological proof, one that draws it much closer to the proof of the Third Meditation and one that, in the end, forces us to reevaluate Descartes's connection to three great figures in the tradition of the ontological proof. St. Anselm, St. Thomas, and Kant. (shrink)

Descartes’s First Meditation employs a series of arguments designed to generate the worry that the senses might not provide sufficient evidence to justify one’staking as certain one’s beliefs about the way the world is. As the meditator considers what principle describes the conditions under which it is possible to attain certain knowledge, one after another doubt-generating device is ushered in, until at last he finds himself like someone caught in a whirlpool, able neither to stand firm nor to swim out. (...) In this paper, I examine one of those devices, namely, what is often referred to as the Madness Argument. In particular, I want to discuss its relation to the Dream Argument and its function in the Meditations as a whole. My position stands in contrast to the interpretations of Anthony Kenny, Margaret Wilson, Michael Williams, and, more recently, Janet Broughton and Catherine Wilson. (shrink)

The answer which Joseph Almog gives to the question which serves as the title of his recent book What Am I? (subtitled: Descartes and the Mind-Body Problem) is based upon his interpretation of (1) and objection to Descartes' argument for the distinction of the mind and the body raised by Antoine Arnauld, as well as Descartes' response to it, and (2) Descartes' letters of 9 February 1645 to Denis Mesland. I will argue that both of these interpretations are incorrect, and (...) as such do not support the conclusions which Almog claims to draw from them. The answer, then to the question of what I am which Almog provides is, I believe, not one Descartes would have held, nor one which his writings support. (Published Online October 13 2005). (shrink)

Despite holding to the essential distinction between mind and body, Descartes did not adopt a life-body dualism. Though humans are the only creatures which can reason, as they are the only creatures whose body is in an intimate union with a soul, they are not the only finite beings who are alive. In the present note, I attempt to determine Descartes'' criteria for something to be ''living.'' Though certain passages associate such a principle with the presence of a properly functioning (...) heart, I show that there are important reasons for also understanding life in terms of a degree of complexity of design. (shrink)

This thesis presents three versions of the concept of time found in the works of René Descartes. First, the time of the world, physically considered: a homogeneous and serial time for which the moments are ordered successively, a divisible and one-dimensional time. Second, the time of the mind: the cogitative experience of the present temporally expanding, a purely mental experience, i. e., without the intervention of the body. Third, the time of the compound of mind and body: a concrete time (...) that entails a share world among bodies and compounds acting and suffering reciprocally. (shrink)

Many critics, Descartes himself included, have seen Hobbes as uncharitable or even incoherent in his Objections to the Meditations on First Philosophy. I argue that when understood within the wider context of his views of the late 1630s and early 1640s, Hobbes's Objections are coherent and reflect his goal of providing an epistemology consistent with a mechanical philosophy. I demonstrate the importance of this epistemology for understanding his Fourth Objection concerning the nature of the wax and contend that Hobbes's brief (...) claims in that Objection are best understood as a summary of the mechanism for scientific knowledge found in his broader work. Far from displaying his confusion, Hobbes's Fourth Objection in fact pinpoints a key weakness of Descartes's faculty psychology: its unintelligibility within a mechanical philosophy. (shrink)

In this book Han Thomas Adriaenssen offers the first comparative exploration of the sceptical reception of representationalism in medieval and early modern philosophy. Descartes is traditionally credited with inaugurating a new kind of scepticism by saying that the direct objects of perception are images in the mind, not external objects, but Adriaenssen shows that as early as the thirteenth century, critics had already found similar problems in Aquinas's theory of representation. He charts the attempts of philosophers in both periods to (...) grapple with these problems, and shows how in order to address the challenges of scepticism and representation, modern philosophers in the wake of Descartes often breathed new life into old ideas, remoulding them in ways that we are just beginning to understand. His book will be valuable for historians interested in the medieval background to early modern thought, and to medievalists looking at continuity with the early modern period. (shrink)

The article focuses on one of the most serious accusations brought against Descartes and modern philosophy, namely “the dualism of substance”. The accusers claim that the human body and soul were viewed as completely separate; consequently, their relationship as such and the united being of man become incomprehensible. As has been shown above, the idea of the separation of the soul from the body did not originate with Descartes; it was formulated much earlier, and repeated by a disciple of Descartes’, (...) Henry Leroy, known as Regius. When Descartes became aware of this bizarre interpretation he was dismayed and sought to clarify the matter. He sought to distinguish between two terms, “distinction” and “separation” and to illuminate the relationship between body and soul at three different levels, i.e. ordinary experience, analytical mind and metaphysical meditation. Eventually, he embraced the paradox of the two natures – the double substantial make-up of the human being, a paradox of patristic inspiration. However, the later history of ideas was not sympathetic to Descartes: nowadays, when one looks up the term “metaphysical dualism” in dictionaries or glossaries, even in the studies of prestigious researchers, one will find views similar to those of the unfaithful disciple Regius. The resilience of this locus obscurus is explained both by the power of a new mode of interpreting discourse and by the ever more privileged position of the reader . Both attitudes are related to modern ideologies and to changes which have occurred in the intersubjective life-world, especially in the communication of the scholarly and academic world. (shrink)

I compare the momenta of Descartes and Lagrange geometrically, and consider cases in which the full generality of Lagrangian momentum is necessary.

Descartes’ epistemologies of meditation and sense imply that we cannot know anything about the mind-body union, either in the Cartesian sense of having scientia or, more interestingly, in terms of any other concept of knowledge available to Descartes. After considering the implications of this conclusion for what we may know about mind-body interaction, it becomes clear that, on Descartes’ view, we at best can be said to know that mind-body interaction, if it does in fact take place, does not violate (...) a set of causal principles, without knowing how mind and body interact, or even if they interact at all. (This article is the winner of the 2010 Rockefeller Prize awarded by the American Philosophical Association.). (shrink)

It is a matter of tacit consensus that rationalist adeptness in urban planning traces its foundations to the philosophy of the Renaissance thinker and mathematician Ren Descartes. This study suggests, in turn, that the planned urban environment of the Renaissance may have also led Descartes, and his intellectual peers, to tenets that became the foundations of modern philosophy and science. The geometric street pattern of the late middle ages and the Renaissance, the planned townscapes, street views and the formal garden (...) design, appeared as parables for the perfection of the universe and the supremacy of critical reason. It is within this urban metaphor that Descartes's philosophical narrative betrays perceptual and conceptual impact from the contrast between convoluted medieval townscapes and the emerging harmonious street patterns where defined vistas and predictable clarity of street views were paramount. The geometrically delineated street views of the Renaissance new town became the spark that lit the philosopher's sagacity in reflecting upon the concept of "clear and distinct ideas." Past suggestions that Descartes was led to his philosophical breakthroughs through his discovery of co-ordinate geometry reinforce further the stance that Renaissance planning predisposed rationalist thought. (shrink)

This paper reflects on the status of Descartes' notion of the mind-body union as an object of knowledge in the framework of his new philosophy of nature, and argues that it should be taken seriously as representing a third kind of real thing or reality—that of human nature. Because it does not meet the criteria of distinctness that the two natures composing it—those of thinking minds and extended bodies— meet, the phenomena referred to it, which are objects of psychology as (...) traditionally understood, fall outside the scope of clear and distinct perception required for knowledge. The prospects for rationalist psychology are bleak, since because of the mind-body union so little of the contents of the human mind are accessible to rational inspection or introspection. Mechanistic natural philosophy on the other hand gives us knowledge only of the physiological and corporeal aspects of the phenomena Descartes classifies as mental. What pertains to the mind-body union can only be known through the senses, moreover, we learn to conceive the mind-body union only through daily experience (“usant seulement de la vie et des conversations ordinaries”, AT 3, 695). I discuss the nature of this experience, and the sense in which Cartesian psychology without being part of his philosophy of nature in the strict sense of the term, can still be seen as a naturalist undertaking in a more traditional sense of nature where life, sentience, reasoning and rational action are all seen as natural phenomena. (shrink)

Descartes's conception of matter changed the account of physical nature in terms of extension and related quantitative terms. Plants and animals were turned into species of machines, whose natural functions can be explained mechanistically. This article reflects on the consequences of this transformation for the psychology of human soul. In so far the soul is rational it lacks extension, yet it is also united with the body and affected by it, and so it is able to act on extended matter. (...) The article examines Descartes's concept of scientia and his different uses of nature, and argues that there is much more continuity between Aristotelian and Cartesian psychology than is usually recognized when it comes to an explanation of the functions of the embodied human soul. If this makes psychology unfit for inclusion in the new science of nature, its object is still a natural phenomenon and has an important place within scientia as Descartes conceived of it. (shrink)

This paper examines Descartes's third primary notion and the distinction between different kinds of knowledge based on different and mutually irreducible primary notions. It discusses the application of the notions of clearness and distinctness to the domain of knowledge based on that of mind-body union. It argues that the consequences of the distinctions Descartes is making with regard to our knowledge of the human mind and nature are rather different from those that have been attributed to Descartes due to the (...) influential Rylean picture of Cartesian mind-body dualism. (shrink)

This paper examines Descartes' controversial theory of the creation of eternal truths and the views of modality attributed to Descartes in recent interpretations of it. It shows why attempts to make Descartes' view intelligible by distinctions of different kinds of modality fail to do justice to his theory, which is radical indeed without being incoherent or involving universal possibilism or irrationalism. Descartes' opposition to traditional rationalist views of modality, it suggests, can be seen instead as foreshadowing contemporary views prefixed, logical (...) structure of reality or of the divine intellect. (shrink)

Cet article étudie la vue cartésienne de l'homme et la connaissance obtenue par la notion de l'union de l'âme et du corps. Le but est d'analyser les conséquences de la distinction cartésienne entre des notions primitives différentes et incomparables, et des différents genres de connaître qui s'en suivent, conséquences qui à cause de l'influence de la version Ryleienne du dualisme cartésien sont restées largement ignorées dans les débats anglo-américains récents. This paper examines Descartes's view of man and the understanding involved (...) in the notion of the mind-body union. The aim is to spell out the implications of Descartes's distinction between different and incomparable primary notion and related kinds of knowledge, which due to the misleading but influential Rylean version of Descartes's mind-body dualism have remained largely unnoticed in the contemporary Anglo-American debate. (shrink)

Descartes's view of modality is analyzed by contrast to two earlier models: the ancient realist one, defended by Boethius, where possibility and necessity are connected to natural potency, and the modern intensionalist one, which dissociates necessary and possible truths from any ontological foundation, treating them as conceptual, a priori given preconditions for any intellect. The emergence of this view is traced from Gilbert of Poitiers to duns Scotus, Ockham and Suarez. The Cartesian theory of the creation of eternal truths, it (...) is argued, involves a rejection of this idea of absolute conceivability and can be seen as a constructivist view of intelligibility and rationality. (shrink)

: In his autobiographical account, the Munqidh min al-Dalāl, al-Ghazālī reflects on his conversion from skepticism to faith. Previous scholarship has interpreted this text as an anticipation of Cartesian positions regarding epistemic certainty. Although the existing similarities between al-Ghazālī and Descartes are striking, the focus of the present essay lies on the different philosophical aims pursued by the two thinkers. It is thus argued that al-Ghazālī operates with a broader notion of the Self than Descartes, because it is inclusive of (...) the body. And it is shown that the two philosophers use completely diverging paradigms. While Descartes models his notion of evidence after mathematical certainty, al-Ghazālī draws his famous 'ilm al-yaqīnī (certain knowledge) from a religious context. (shrink)