L'auteur résume dans cet article le contenu du commentaire du Phèdre qui doit paraître en mai 1998. Le Phèdre constitue un véritable « manifeste » qui présente un programme dans lequel Platon, alors âgé de soixante à soixante-cinq ans environ, prend position sur la question de l'écriture, à un moment où celle-ci était en train de se substituer à l'oralité pour constituer un instrument de communication privilégié. Dans le Phèdre, Platon veut montrer que, au moment même où il écrit, il (...) est le plus grand écrivain de la Grèce. Il démontre ce point en deux étapes: il entame tout d'abord une « joute oratoire » avec Lysias, alors considéré comme le meilleur écrivain de son temps, où il fait montre de sa supériorité sur les rhéteurs tant sur la forme que sur le contenu; il propose ensuite une théorie de l'art d'écrire dont le caractère adéquat se fonde sur la méthode dialectique. Il énonce de surcroît les trois critères fondamentaux qui doivent gouverner tous les discours, que ceux-ci soient écrits ou oraux: 1 / il faut connaître l'essence de la chose dont on parle; 2 / il faut connaître la nature des âmes auxquelles on s'adresse; 3 / il faut adapter les contenus des messages que l'on veut communiquer aux capacités de réception des âmes auxquelles on s'adresse. Toutefois, les messages du philosophe ne peuvent être transmis par la seule écriture: les choses les plus précieuses, le philosophe les écrit dans les âmes des hommes, autrement dit, il les communique dans le registre de l' « oralité dialectique ». Les discours écrits n'ont aucune autonomie, puisqu'ils ont, de fait, besoin du « secours » de l'auteur. Pour comprendre les discours écrits, fussent-ils les meilleurs, une connaissance préalable des choses dont ils traitent est nécessaire, connaissance qui ne peut être obtenue que par des voies différentes de celles que fournissent les discours écrits. The author summarizes in this article the content of his Phaedrus' commentary which will appear in May of 1998. The Phaedrus constitutes a true « manifesto ». It presents a programme in which Plato (who was then aged sixty or sixty-five), defends a position on the question of writing at a time when writing was being substituted for orality as the primary instrument of communication. In the Phaedrus, Plato wants to show, while he is writing it, that he is the greatest writer in Greece. He demonstrates this point in two stages: first, he initiates an « oratorical contest » with Lysias who was then considered the best writer of this time, where he shows his superiority over the orators both in form and in content; then, he proposes a theory of the art of writing the appropriate character of which is based on the dialectical method. Moreover, Plato states the three primary criteria which must govern any discourse whether oral or written: 1 / knowledge of the essence of what one speaks; 2 / knowledge of the nature of the souls to be addressed; 3 / knowledge of the content of the messages that one addressed. However, the messages of the philosopher cannot be transmitted only by writing. The most precious things are written by the philosopher in the souls of men, in other words, he communicates them in the register of dialectical orality. Written discourses have no autonomy since they need the « help » of the author. To understand written discourse, including the best, a preliminary knowledge of the things with which they deal is necessary, knowledge which can only be obtained through paths different from those which are provided by written discourse. (shrink)

This paper elucidates and interrogates Schopenhauer’s notion of will and its relation to ideas about the unconscious, with the aim of addressing its significance as an exercise in philosophical psychology. Schopenhauer aims at a global metaphysics, a theory of the essence of the world as it is in itself. He calls this essence will (Wille), which, to put it briefly, he understands as a blind striving for existence, life, and reproduction. Human beings have the same essence as (...) all other manifestations of will in the world, and this has several consequences for Schopenhauer's conception of humanity. Neither rationality, nor intentional action, nor consciousness is primary or foundational in human beings. The true core of the personality is not the self-conscious ‘I’ or subject of knowledge, but rather the will, which is fundamentally blind and without knowledge, but which interacts with the intellect almost as an agent distinct from it. Schopenhauer makes a number of psychological observations about the interplay of intellect and will. These include the omnipresence of sexual desire in or beneath our experience; the persistence of desires and affects unknown to the self-conscious intellect; the will's capacity to prohibit representations in the intellect that are liable to arouse certain emotions; and the occurrence of madness when memories painful to the will are shielded from the intellect and arbitrary representations are substituted. (shrink)

In this paper I argue that John Locke is not ontologically committed to corpuscularian real essences. I do this by laying out his antirealist argument against corpuscular real essences within the Essay and then defend it. I then identify a version of real essences to which he is ontologically committed. Recognition of the antirealist argument in the Essay should significantly alter our interpretation of the Essay.

This paper examines the problem of natural kinds, a key problem within feminist theory, and argues for a non-instrumental realist account of group identity. I suggest that a reconstructed theory of essence helps to make sense of group membership because it combines a conventional account of groups with a realist commitment to there being something responsible for the appearance of regularities in the world. The claim that natural kind membership is a matter of similarity relationships manages to avoid metaphysical, (...) universal property-based essentialism and, at the same time, points to interested generative mechanisms underlying the appearance of the regularities that make sense of kind membership. Finally, I suggest that the concepts 'real essence' and 'internal constitution' offer a new way to conceive 'sex' and 'gender', and that Adorno's notion of non-identity is a way to think group membership non-instrumentally. (shrink)

In this encyclopedia entry I canvass the current interpretations of John Locke's concept of Real Essence and the role it plays in his philosophy.

In this paper I criticize arguments by Pauline Phemister and Matthew Stuart that John Locke's position in his An Essay Concerning Human Understanding allows for natural kinds based on similarities among real essences. On my reading of Locke, not only are similarities among real essences irrelevant to species, but natural kind theories based on them are unintelligible.

In this paper I criticize the interpretations of John Locke on natural kinds offered by Matthew Stuart and Pauline Phemister who argue that Locke’s Essay Concerning Human Understanding allows for natural kinds based on similar real essences. By contrast, I argue for a conventionalist reading of Locke by reinterpreting his account of the status of real essences within the Essay and arguing that Locke denies that the new science of mechanism can justify the claim that similarities in corpuscular (...) structure imply similarities in sensible qualities. I argue further that Locke rejects as meaningless any talk of kinds that appeals to similarities among real essences. On my reading of Locke, similarities in real essences are not only irrelevant to species, but natural kind theories based on themare unintelligible. (shrink)

While the tradition of Locke scholarship holds that both Locke and Boyle are species anti-realists, there is evidence that this interpretation is false. Specifically, there has been some recent work on Boyle showing that he is, unlike Locke, a species realist. In this paper I argue that once we see Boyle as a realist about natural species, it is plausible to read some of Locke’s most formidable anti-realist arguments as directed specifically at Boyle’s account of natural species. This is a (...) break from the tradition because no one in the literature has yet suggested that some of Locke’s arguments in Book III of the Essay include a criticism of Boyle’s doctrine of species. Moreover, identifying Boyle as Locke’s intended target illuminates some of the more vexing passages in the Essay concerning real essences. (shrink)

I argue that Locke’s various descriptions of real essence pick out one and the same thing, namely a nature that can be ascribed to many things, and in terms of which we can get matters of classification right or wrong. On my reading, Locke does not attack real essences of the sort that are the essences of real species, but rather the presumption that a sorting according to our species concepts and their names is a sorting (...) of things according to their real essences. And the lesson of Locke’s empirical argument against that presumption, I argue, is that our species concepts often function more like higher taxa, grouping together things that knowledge of their real essences would distinguish into distinct lowest species. (shrink)

Jean-Michel Vienne; IX*—Locke on Real Essence and Internal Constitution1, Proceedings of the Aristotelian Society, Volume 93, Issue 1, 1 June 1993, Pages 139–15.

Jean-Michel Vienne; IX*—Locke on Real Essence and Internal Constitution1, Proceedings of the Aristotelian Society, Volume 93, Issue 1, 1 June 1993, Pages 139–15.

‘Water is H2O’ is one of the most frequently cited sentences in analytic philosophy, thanks to the seminal work of Saul Kripke and Hilary Putnam in the 1970s on the semantics of natural kind terms. Both of these philosophers owe an intellectual debt to the empiricist metaphysics of John Locke's Essay Concerning Human Understanding, while disagreeing profoundly with Locke about the reality of natural kinds. Locke employs an intriguing example involving water to support his view that kinds (or ‘species’), such (...) as water and gold, are the workmanship of the human mind. This is the point of his story about a winter visitor to England from Jamaica, who is astonished to find that the water in his basin has turned solid overnight, and proceeds to call it ‘hardened water’. Locke criticizes this judgement, maintaining that it is more consonant with common sense to regard water and ice as different kinds of substance. Putnam, by implication, disagrees. Deploying his imaginary example of Twin Earth—a distant planet where a watery-looking substance, XYZ, rather than H2O, fills the oceans and rivers—he maintains that common sense supports the judgement that XYZ and H2O, despite their superficial similarity, are not the same kind of substance, precisely because their molecular compositions are different. Here it will be argued that both views are mistaken, but that, in this dispute, Locke has more right on his side than his modern opponents do. (shrink)

Conventionalists about modality deny that the world has a modal structure. Metaphysical necessity is not a real feature of the world, but a linguistic necessity grounded in conventions governing our use of words. In this paper, I focus on Allan Sidelle’s conventionalist account and especially on his claim that the idea of real necessity should be abandoned since it is puzzling. My strategy for the defense of the realist notion of modality is twofold. First, the ontology of undifferentiated (...) stuff, which underlies his conventionalist account, is itself very puzzling and in need of further defense. Second, the alleged problems of the realist interpretation are based on an empiricist view of the world. (shrink)

J. L. Mackie's famous claim that Locke ‘anticipates’ Kripke's Causal Theory of Reference rests, I suggest, upon a pair of important misunderstandings. Contra Mackie, as well as the more recent accounts of Paul Guyer and Michael Ayers, Lockean Real Essences consist of those features of an entity from which all of its experienceable properties can be logically deduced; thus a substantival Real Essence consists of features of a Real Constitution plus logically necessary objective connections between them (...) and features of some particular Nominal Essence. Furthermore, what Locke actually anticipates is the most significant contemporary challenge to the CTR: the qua‐problem. (shrink)

In his lectures on Logic and Metaphysics, Kant distinguishes between logical and real essences. While the former is related to concepts and is knowable, the latter is related to things and is unknowable. In this paper, I argue that the unknowability is explained by the modal characteristic of real essences as a necessitating ground on which a priori knowledge is impossible. I also show how this claim is related to the unknowable necessity of particular laws of nature. Since (...) laws of nature are conceived as grounded in real essences, the unknowability of the latter is equivalent to Kant's other claim that there can be no knowledge of the necessity of particular laws of nature. Necessity can only be known a priori, and therefore, the necessity of particular laws is only assumed and conceived as grounded in something unknowable, a real essence. This conclusion will allow me to attribute to Kant a position I label as “regulative essentialism”, meaning that real essences have an indispensable role in accordance with the rational interest to explain nature as a system of laws and natural kinds, combined with an epistemic humility about the correspondence of our empirical concepts to real essences. (shrink)

J. L. Mackie's famous claim that Locke ‘anticipates’ Kripke's Causal Theory of Reference (CTR) rests, I suggest, upon a pair of important misunderstandings. Contra Mackie, as well as the more recent accounts of Paul Guyer and Michael Ayers, Lockean Real Essences consist of those features of an entity from which all of its experienceable properties can be logically deduced; thus a substantival Real Essence consists of features of a Real Constitution plus logically necessary objective connections between (...) them and features of some particular Nominal Essence. Furthermore, what Locke actually anticipates is the most significant contemporary challenge to the CTR: the qua‐problem. (shrink)

This paper explores the prospects of combining two views. The first view is metaphysical rationalism : all things have an explanation. The second view is metaphysical essentialism: there are real essences. The exploration is motivated by a conflict between the views. Metaphysical essentialism posits facts about essences. Metaphysical rationalism demands explanations for all facts. But facts about essences appear to resist explanation. I consider two solutions to the conflict. Exemption solutions attempt to exempt facts about essences from the demand (...) for explanation. Explanation solutions attempt to explain facts about essences. I argue that exemption solutions are less promising than explanation solutions. I then consider how explanation solutions might be developed. I suggest that a “generative” approach is most promising. I tentatively conclude that the prospects for combining metaphysical rationalism and metaphysical essentialism turn on the viability of a generative approach. This sets the agenda for defending the combination as well as the more general project of explaining essences. (shrink)

Aquinas’ so-called “Intellectus essentiae Argument” for the distinction between being and essence is notoriously suspect, including among defenders of Aquinas’ distinction. For the paper in this volume, I take as my starting point the recent defense of the argument by Fr. Lawrence Dewan, O.P. Fr. Dewan’s project is unsuccessful. Pointing out some shortcomings in his readings allows me to take up his call to highlight the “formal” or “quidditative side” of Aquinas’ metaphysics, in this case in regards to the (...) proofs of the “real distinction.” Accordingly, the second half of this paper sets forth a way in which the famous “Intellectus essentiae Argument” of De Ente et Essentia 4 can succeed as a proof of the real distinction. Aquinas’ argument presupposes the prior real distinction between essence and supposit or individual substance. Esse is the ontological component that makes true our judgments that substances actually are: Obama exists. By contrast, this “truth-maker” cannot be predicated of humanity, although it is in Obama as really distinct from him. If Aquinas’ reasoning in this most contentious of his proofs can be saved, so, perhaps, can most of his other proofs. (shrink)

The subject of this essay is propria and their relation to essence. Propria, roughly characterized, are those real properties of a thing which are natural but nonessential to it, and which are said to “flow from” the thing’s essence, where this “flows from” relation is understood to designate a kind of explanatory relation. For example, it is said that Socrates’s risibility flows from his essential humanity; and it is said that salt’s solubility in water flows from the (...) essential natures of both salt and water. The question I raise and attempt to answer in this essay is: In what sense do propria “flow from” essences? What kind of explanatory relation is this exactly? Some suggest that it is a relation of logical consequence ; others, of grounding ; and still others, of formal causation. In this essay, I reintroduce and defend a view suggested by the late scholastic Spanish philosopher and theologian Francisco Suárez, who in 1597 wrote that effluence is best understood as a very special kind of efficient causation, which we can call the relation of emanation. The thesis of this essay, then, is that propria emanate from essences. Along the way, this paper offers a new taxonomy of types of propria; it explains the significance of propria for the metaphysics and epistemology of essences; it discusses at length varieties of efficient causation ; and then it offers an extensive abductive argument in favor of Suárez’s account, whereby the former accounts of effluence are critiqued, each in turn, and Suárez’s view is motivated and ultimately shown to be superior to its competitors. (shrink)

_Real Essentialism_ presents a comprehensive defence of neo-Aristotelian essentialism. Do objects have essences? Must they be the kinds of things they are in spite of the changes they undergo? Can we know what things are really like – can we define and classify reality? Many, if not most, philosophers doubt this, influenced by centuries of empiricism, and by the anti-essentialism of Wittgenstein, Quine, Popper, and other thinkers. _Real Essentialism_ reinvigorates the tradition of realist, essentialist metaphysics, defending the reality and knowability (...) of essence, the possibility of objective, immutable definition, and its relevance to contemporary scientific and metaphysical issues such as whether essence transcends physics and chemistry, the essence of life, the nature of biological species, and the nature of the person. (shrink)

Nowadays, essentialism has obtained various senses and its extension reaches out over many branches of study who have some immediate connection with it. Socrates, Plato, Aristotle, Saul Kripke, Hilary Putnam and David Wiggins are the notable upholders of essentialism. The Essentialist movement which stemmed from the view that philosophy is a speculative study of Reality was temporarily suspended or stagnated by the spirited movement of the logical positivists like Moritz Schlick, Hans Reichenbach, Rudolf Carnap and A. J. Ayer. According to (...) these philosophers, philosophy is simply an activity of analysis of the fundamental concepts of ordinary language or of science or of any other discipline. Such concept—analysis—philosophers are called anti-essentialist. Here, I shall concentrate on the views of Aristotle. I shall discuss the doctrine of essence, natural kinds, real essence in favour of essentialism and also discuss W. V. O. Quine’s view as an anti-essentialist trend. At last I shall try to examine whether and to what extent an attack of essences reflects back certain essentialist commitments, which is to see what reasonable theory of essences can be eked out from the entire exercise. (shrink)

According to essentialism, metaphysical modality is founded in the essences of things, where the essence of a thing is roughly akin to its real definition. According to potentialism (also known as dispositionalism), metaphysical modality is founded in the potentialities of things, where a potentiality is roughly the generalized notion of a disposition. Essentialism and potentialism have much in common, but little has been written about their relation to each other. The aim of this paper is to understand better (...) the relations between essence and potentiality, on the one hand, and between essentialism and potentialism, on the other. It is argued, first, that essence and potentiality are not duals but interestingly linked by a weaker relation dubbed ‘semi-duality’; second, that given this weaker relation, essentialism and potentialism are not natural allies but rather natural competitors; and third, that the semi-duality of essence and potentiality allows the potentialist to respond to an important explanatory challenge by using essentialist resources without thereby committing to essentialism. (shrink)

One currently popular methodology of metaphysics has it that ‘intuitions’ play an evidential role with respect to metaphysical claims. This chapter defends a realist methodology of metaphysics that implies that any rational being, simply in virtue of being rational, is necessarily capable of grasping the essences of at least some mind-independent entities. The notion of essence in play here is Aristotelian, whereby an entity’s essence is captured by an account of what that entity is, or what it is (...) to be that entity. Concepts are just ways of thinking of things and, as such, may or may not be adequate to the real natures — the essences — of the things being thought of. Our ‘intuitions’, particularly as revealed by aptly constructed thought experiments, may cast interesting light on some of our concepts, but they are not and cannot be reliable guides to mind-independent truths of essence. (shrink)

Matter’s real essence is a ground for certain features of phenomena. Things in themselves are likewise a ground for certain features of phenomena. How do these claims relate? The former is a causal essentialism about physics, Stang argues; and the features so grounded are phenomenally nomically necessary. The latter involves a distinctive ontology of things in themselves, I argue; but the features so grounded are not noumenally nomically necessary. Stang’s version of Kant’s modal metaphysics is admirable, but does (...) not go far enough. Kant’s causal essentialism involves the essences of fundamental properties, as well as of matter. And things in themselves are grounds, because they are substances, the ‘substrate’ of phenomena. (shrink)

What is the new essentialist asking us to accept? Not that there are natural kinds, nor that there are intrinsic causal powers. These things could be accepted without a commitment to essentialism. They are asking us to accept something akin to the Kripke‐Putnam position: a metaphysical theory about kind‐membership in virtue of essential properties. But Salmon has shown that there is no valid argument for the Kripke‐Putnam position: no valid inference that gets us from reference to essence. Why then (...) should we accept essentialism? A remaining reason is Ellis's argument by display: we should buy essentialism because of the benefits it will bring. But are these benefits real? The problem is that the putative benefits of essentialism – that the laws of nature are necessary, that the problem of induction is solved, and so on – look actually to be the assumptions of Ellis's theory. If that is the case, there is no real benefit to be gained from adopting the theory. The argument for essentialism is therefore underdetermined and it remains possible to accept natural kinds into one's ontology without accepting their corresponding essences. (shrink)

We may define words or concepts, and we may also, as Aristotle and others have thought, define the things for which words stand and of which concepts are concepts. Definitions of words or concepts may be explicit or implicit, and may seek to report preexisting synonymies, as Quine put it, but they may instead be wholly or partly stipulative. Definition by abstraction, of which Hume’s principle is a much discussed example, seek to define a term-forming operator, such as the number (...) operator, by fixing the truth-conditions of identity-statements featuring terms formed by means of that operator. Such definitions are a species of implicit definition. They are typically at least partly stipulative. Definitions of things, or real definitions, are, by contrast, typically conceived as true or false statements about the nature or essence of their definienda, and so not stipulative. There thus appears to be an obvious and head-on clash between taking Hume’s principle as an implicit and at least partly stipultative definition of the number operator and taking it as a real definition, stating the nature or essence of cardinal numbers. This paper argues that this apparent tension can be resolved, and that resolving it sheds light on part of the epistemology or essence and necessity, showing how some of our knowledge of essence and necessity can be a priori. (shrink)

In a recent paper Copi has argued for the admission of the term “essence” into scientific terminology. His primary reason is that the increasing adequacy of scientific theories is evidence of a gradual approximation to the real essences of things. Copi is aware that the laws of modern science are not to be taken as formulations of essences. But, he claims, “that is an ideal towards which science strives… Centuries hence wiser men will have radically different and more (...) adequate theories, and their notions will be closer approximations than ours to the real essences of things.”. (shrink)

Locke, in his discussion of essences, makes extensive use of a distinction he introduces between nominal and real essences. This distinction has always been found interesting and important, and in fact, R.I. Aaron said of it that ‘there is no more important distinction in the Essay.’ Nevertheless, to say there has not been general agreement about what Locke was getting at is putting it mildly. Interpretations of Locke's point in making such a distinction have varied widely, depending upon whether (...) the importance of the real or the nominal essence is stressed. Locke tells us we should distinguish the nominal essence, which is the abstract idea to which a general name is attached and for which it stands, from the real essence, which is the ‘real internal, but generally in Substances, unknown Constitution of Things, whereon their discoverable Qualities depend.’. (shrink)

We present a novel methodology for building humanlike artificially intelligent systems. We take as a model the only existing systems which are universally accepted as intelligent: humans. We emphasize building intelligent systems which are not masters of a single domain, but, like humans, are adept at performing a variety of complex tasks in the real world. Using evidence from cognitive science and neuroscience, we suggest four alternative essences of intelligence to those held by classical AI. These are the parallel (...) themes of development, social interaction, embodiment, and integration. Following a methodology based on these themes, we have built a physical humanoid robot. In this paper we present our methodology and the insights it affords for facilitating learning, simplifying the computation underlying rich behavior, and building systems that can scale to more complex tasks in more challenging environments. (shrink)

This paper investigates Kant’s account of “real essence” and of a thing’s “nature”. Notwithstanding their wide negligence in the literature, these concepts belong to the central ones of Kant’s metaphysics. I argue that, on the one hand, Kant is in continuity with the Aristotelian-Scholastic tradition of essence. But, on the other hand, he also follows Locke in distinguishing between “logical” and “real” essence. Contrary to recent attempts of aligning real essence with contemporary approaches (...) to essence, I will defend the thesis that Kant equates real essence and (formal) nature, and that real essence has a causal, but no constitutive role. I shall also respond to potential objections and discuss some developments of Kant’s views. (shrink)

The article proposes a new solution to the long-standing problem of the universality of essences in Spinoza's ontology. It argues that, according to Spinoza, particular things in nature possess unique essences, but that these essences coexist with more general, mind-dependent species-essences, constructed by finite minds on the basis of similarities that obtain among the properties of formally-real particulars. This account provides the best fit both with the textual evidence and with Spinoza's other metaphysical and epistemological commitments. The article offers (...) new readings of how Spinoza understands not just the nature of essence, but also the nature of being, reason, striving, definitions, and different kinds of knowledge. (shrink)

Recent work on essence describes essence as assimilated to definition. It also posits a plurality of kinds of essence.Howdoes assimilation relate to pluralism? According to one view, a kind of essence is adequate only if it is definitional: something is essential to an item, in the relevant sense, only if it is part of what it is to be that item. In this paper, I argue that assimilation and pluralism are in tension with respect to consequentialist (...) essence. This is problematic given that, as a methodological prescription, some philosophers advise us to work with consequentialist essence. In this paper, I develop a theory of constitutive essence and use it to resolve the problem by defining an adequate notion of consequentialist essence that preserves the methodological prescription. (shrink)

When I classify Fluffy as a cat, I appear to do so out of an appreciation of a prior metaphysical fact, namely, that she has a nature or essence common to creatures we classify as cats. Locke turns this picture on its head. Our actual practices of naming and sorting individuals into kinds proceed according to ideas in the mind. As Locke puts it, species (kinds) are ‘the Workmanship of the Understanding,’ not the workmanship of nature, because their essences (...) consist in abstract ideas, or ‘nominal essences,’ we make. Many take Locke to mean that the observable similarities and differences between things leave it undetermined how we are to group and distinguish them, so that classification is, and must be, a matter of convention. And while Locke never denies that individuals have real essences, it is argued that knowledge of them would not reveal natural boundaries, either. On this influential reading, nature does not draw boundaries between kinds, and she makes this fact apparent to us. I argue that Locke’s claim that nature does not determine the ‘Boundaries of the Species of Things’ should be understood as the claim that nature does not draw the variable boundaries set out in the nominal essences we make. Differences in our nominal essences reflect differences in speakers’ knowledge of external ‘standards,’ which we latch on to by way of their ‘leading’ qualities, which present the mind with a limited number of unique and highly salient bases for classification. On my reading, nature may very well draw boundaries of her own. (shrink)

Martin Heidegger devotes extensive discussion to medieval philosophers, particularly to their treatment of Truth and Being. On both these topics, Heidegger accuses them of forgetting the question of Being and of being responsible for subjugating truth to the modern crusade for certainty: ‘truth is denied its own mode of being’ and is subordinated ‘to an intellect that judges correctly’. Though there are some studies that discuss Heidegger’s debt to and criticism of medieval thought, particularly that of Thomas Aquinas, there is (...) no constructive reply to his assertions. As a result, Heidegger’s critique had an unprecedented effect on the credibility of medieval philosophy, whereby great portions of the philosophical community dismiss it altogether as an illegitimate Onto‐Theology. It is the aim of this study to offer a constructive reply that will fundamentally grapple with these allegations. By constructive reply we mean not only a reply that avoids the problems Heidegger raises regarding existence, essence and truth, but more importantly, one that uses Heidegger’s criticism in order to present a more insightful account of these notions. The present study is composed of two parts where the second serves as a sort of addendum. The first part, the core of this study, is an attempt to develop an understanding of the distinction between essence and existence that, on the one hand, accords with Heidegger’s criticism while on the other hand advances our understanding of how we think and understand reality. After presenting Heidegger’s depiction of Aquinas’s distinction between essence and existence (esse) as a real distinction, the study will present several views propounded by scholars of Aquinas regarding the status of this distinction. It will be argued that it is not clear whether the distinction is real, formal or conceptual, and that different types of distinction are applied in different places, particularly in regard to the phantasm that Aquinas considers essential to the human act of thinking. The second part diverges from the first part and focuses on Heidegger’s criticism of Aquinas’s conception of truth as adequation, i.e., what it is that grounds the possibility of truth as adequation. This divergence is necessary in order to present a full metaphysical response to Heidegger’s criticism. Since the aim of the present study is to argue that Aquinas’s philosophical system can contend with Heidegger’s criticism, a partial reply would greatly diminish its effectiveness. (shrink)

Do scientific theories limit human knowledge? In other words, are there physical variables hidden by essence forever? We argue for negative answers and illustrate our point on chaotic classical dynamical systems. We emphasize parallels with quantum theory and conclude that the common real numbers are, de facto, the hidden variables of classical physics. Consequently, real numbers should not be considered as ``physically real" and classical mechanics, like quantum physics, is indeterministic.