Aquinas: Metaphysics

This contribution proposes an interpretation of Thomas Aquinas’s philosophy of mathematics. It is argued that Aquinas’s philosophy of mathematics is a coherent view whose main features enable us to understand it as a moderate realism according to which mathematical objects have an esse intentionale. This esse intentionale involves both mathematicians’ intellectual activity and natural things being knowable mathematically. It is shown that, in Aquinas’s view, mathematics’ constructive part does not conflict with mathematical realism. It is also held that mathematics’ imaginative (...) reasoning is coherent with Aquinas’s doctrine of formal abstraction and his realism. It focuses on some of Aquinas’s texts, which it places within their textual and doctrinal context and interprets them in the light of some historical elements. (shrink)

This present article examines an argument in Aquinas’s De potentia, q. 3, a. 9, in which Aquinas argues that the human soul must be created by God. After introducing the relevance of the problem and discussing the state of the literature, I lay out Aquinas’s argument and defend it by appealing to his broader metaphysical commitments. I then turn to two difficulties raised in the literature by B.C. Bazan and Lawrence Joseph Kaiser. Bazan argues that Aquinas’s claim that the human (...) soul must be created by God leads to internal inconsistencies within Aquinas’s metaphysical system. While not explicitly criticizing Aquinas, Kaiser’s account of the eduction of forms from matter also raises a few problems for the consistency of Aquinas’s claim. In response to Bazan and Kaiser, I argue that a firm grasp of Aquinas’s semantics dissolves the criticisms. (shrink)

The third Meditation is typically understood to contain two a posteriori arguments for the existence of God. The author focuses on the second argument, where Descartes proves the existence of God partly in virtue of proving that Descartes cannot be the cause of himself. To establish this, Descartes argues that if he were the cause of himself, then he would endow himself with any conceivable perfection. The justification for this claim is that bringing about a substance is more difficult than (...) creating an attribute, so anything that can do the former can do the latter. While current explanations of this justification are either implausible or inadequate, the author argues that this principle derives support from a scholastic distinction between being-as-such and determinate being. With this distinction in view, we can make sense of Descartes's argument without appealing to ambiguous or inadequate notions. (shrink)

Der hier vorliegende Text befasst sich mit der Rezeption von Aristoteles’ Metaphysik Λ bei Albertus Magnus und Thomas von Aquin. Er stellt das Material bereit für die Auswertung, die als Band 61 der Bochumer Studien zur Philosophie unter dem Titel Zur mittelalterlichen Herkunft einiger Theoreme in der modernen Aristoteles-Interpretation Eine Fallstudie anhand der Kommentare von Albertus Magnus und Thomas von Aquin zu Aristoteles’ Metaphysik Λ, bei John Benjamins Publishing Company, Amsterdam / Philadelphia 2024, erscheinen wird. **************************** This text deals with (...) the reception of Aristotle's Metaphysics Λ by Albertus Magnus and Thomas Aquinas. It provides the material for the analysis, which will be published as volume 61 of the BochumerStudien zur Philosophie under the title "Zur mittelalterlichenHerkunft einiger Theoreme in der modernenAristoteles-Interpretation. Eine Fallstudie anhand derKommentare von Albertus Magnus und Thomas vonAquin zu Aristoteles' Metaphysik Λ," by John Benjamins Publishing Company, Amsterdam / Philadelphia, 2024. (shrink)

In In V Metaphysics, lec. 9, Aquinas distinguishes between “being by accident” (ens per accidens) and “being by itself” (ens per se) and includes the nine accidental categories under the latter. But isn’t substance a being per se while accidents are, by definition, accidental beings? Several authors—including Ralph McInerny, Paul Symington, and Greg Doolan—have offered explanations of this strange classification. Drawing on an overlooked parallel text in the Posterior Analytics commentary and on Aquinas’s critique of Avicenna’s understanding of accidental denominatives, (...) this paper presents an alternative explanation of the lecture. In the process, it clarifies how Aquinas views the relation of the ten categories to predication and suggests important implications for how we should understand the analogy of being and the phrase “substantial being” (esse substantiale). -/- [Winner of the Leo Elder's Junior Scholar Essay Contest (2024)]. (shrink)

Gilson’s Being and Some Philosophers (BSP) has been widely influential well beyond Thomistic circles, but its modern historical sources and logical consequences call for further investigation. The first part of this two-part article explores three modern semantic assumptions or principles without which BSP’s innovative theory of existential judgment cannot be fully appreciated—the existential neutrality of the copula ubiquitous among modern logicians; Kant’s introduction of a positing or “thetic” function of judgment, the understanding of which evolved in nineteenth-century logic; and the (...) distinction between predication and assertion, generally accepted by late nineteenth century logicians. Part two of this paper offers a rereading of Gilson’s BSP as an implicit critique of and alternative to Maritain’s synthesis of Aquinas with these modern developments. (shrink)

The coherence objection to the doctrine of the Incarnation maintains that it is impossible for one individual to have both the attributes of God and the attributes of a human being. This article examines Thomas Aquinas’s answer to this objection. I challenge the dominant, mereological interpretation of Aquinas’s position and, in light of this challenge, develop and defend a new alternative interpretation of Aquinas’s response to this important objection to Christian doctrine.

This article develops an argument in defense of the claim that Aquinas holds that there are some kinds of activities which can be performed only by persons. In particular, it is argued that Aquinas holds that only persons can engage in the activities proper to a rational nature, e.g., the activities of intellect and will. Next, the article turns to discuss two implications of this thesis concerning Aquinas’s concept of a person. First, the thesis can be used to resolve a (...) prominent scholarly debate concerning Aquinas’s views on the possibility of human persons surviving their bodily deaths. Second, it also points to a problem with a leading interpretation of Aquinas’ account of the Christian doctrine of the Incarnation. Finally, the article concludes by discussing how a correct interpretation of Aquinas’s views on these matters is related to a broader scholarly debate concerning the history of the Western concept of a person. (shrink)

The object of our reflection is to examine whether Aristotle's proof of the eternity of the Universe has a scientific character or only a dialectical one, as Thomas Aquinas claims. On this response depends faith in Creation. -/- L’objet de notre réflexion est d’examiner si la preuve de l’éternité de l’Univers avancée par Aristote a un caractère scientifique ou bien seulement dialectique, comme le prétend Thomas d’Aquin. De cette réponse dépend la foi en la Création.

Aquinas, Ockham, and Burdan all claim that a person can be numerically identical over time, despite changes in size, shape, and color. How can we reconcile this with the Indiscernibility of Identicals, the principle that numerical identity implies indiscernibility across time? Almost all contemporary metaphysicians regard the Indiscernibility of Identicals as axiomatic. But I will argue that Aquinas, Ockham, and Burdan would reject it, perhaps in favor of a principle restricted to indiscernibility at a time.

El objetivo del presente trabajo es poner de manifiesto las dificultades que implica desde su origen mismo la estructura argumentativa adoptada en este respecto por Tomás y, ulteriormente, mostrar que dicha estructura contiene el germen de su propia disolución, así como tendencialmente también el de la disolución de la metafísica teológica como disciplina filosófica.

Thomas Aquinas embraces a controversial claim about the way in which parts of a substance depend on the substance’s substantial form. On his metaphysics, a ‘substantial form’ is not merely a relation among already existing things, in virtue of which (for example) the arrangement or configuration of those things would count as a substance. The substantial form is rather responsible for the identity or nature of the parts of the substance such a form constitutes. Aquinas’ controversial claim can be roughly (...) put as the view that things are members of their kind in virtue of their substantial form. To put it simply, Aquinas’ claim results in the implication that, every time the xs come to compose a y, those xs have to undergo a change in kind membership. -/- This has been called the “homonymy principle,” and it follows from Aquinas’ view of substantial forms, and specifically from the position that substantial forms inform prime matter, rather than substance-parts. The aim of this paper will be to defend that the Thomistic claim that substantial forms account for the determinate actuality of every part of a substance is plausible and coherent. After defending the Thomistic account, I propose that approaching problems of material composition as a Thomist has a significant, oft-overlooked advantage of involving a thorough-going naturalistic methodology that resolves such problems by appeal to empirical considerations. (shrink)

This paper tries to understand existence as identified with Aquinas' esse in a right way. The author distinguishes among facticity and existence, because facticity it a mere negative understanding of existence as the negation of nothing. But existence is not only a negative thing, but a positive one, therefore it is not still described by this negative definition. Existence includes facticity but is not only facticity. Existence is the actuality of essence and that description does not diminish Aquinas' understanding of (...) esse but puts it in its true dimension. (shrink)

This article focuses on some topics in Jeffrey Brower’s recent and excellent book, Aquinas’s Ontology of the Material World: Change, Hylomorphism, and Material Objects. Part of Brower’s goal for the book is to reconstruct Aquinas’s views. I offer some reflections on Brower’s use of this metaphor of reconstruction, before considering four topics in some detail. These are: 1. Brower’s discussion of the relation between Aristotle’s Ten Categories and the not-obviously-connected four-fold division of being into substance, form, prime matter, and accidental (...) unity. 2. Brower’s interpretation of prime matter as “non-individual stuff.” 3. Brower’s account of numerical sameness without identity along with some discussion of how this is supposed to be useful for solving a particular puzzle about accidental change. 4. I’ll close with some reflections on Brower’s somewhat novel solution to a longstanding problem with Aquinas’s metaphysics of the afterlife. (shrink)

The metaphysics underlying differences in degree of qualitative intensity was widely debated in the medieval period. Medieval Aristotelians agreed that subjects possess qualities in virtue of inherent accidental forms. Yet, there was considerable disagreement about what happens at the level of form when a quality increases or decreases in its intensity. For instance, what happens when a pot of water on the stove gets hotter? Is the water’s previous form of heat replaced by a new one, or does the same (...) form of heat persist? Does the form of heat itself undergo a change, or does only the water undergo a change? While there have been several important studies on the medieval debate about the “intension and remission of forms,” little attention has been paid to Thomas Aquinas’s intriguing theory. Aquinas claims that a subject’s quality increases in intensity in virtue of the subject “participating” more perfectly in an invariable form. This paper examines Aquinas’s conception of the participation relationship between a substance and its accidental forms; and his metaphysical analysis of changes of intensification. (shrink)

Résumé : Avec ce second dialogue, Salviati veut lever les difficultés de Simplicio sur la distinction réelle d’essence et d’être ainsi que sur la notion d’acte d’être (actus essendi). Ayant le sentiment d’avoir brûlé les étapes, il lui propose de revenir en amont sur la détermination du sujet exact de la métaphysique selon Thomas d’Aquin. Il progressera en deux points : le passage de “l’être premier perçu” à “l’être commun” ou “être en tant qu’être” par un jugement dit de “séparation”, (...) puis la définition du sujet propre de la métaphysique comme “être négativement ou indifféremment immatériel”. Arrivé à cette conclusion, Salviati entend conduire Simplicio à comprendre l’autonomie des principes de la métaphysique vis-à-vis de la philosophie de la nature. Simplicio demeure curieux mais dubitatif. - Abstract: With this second dialogue, Salviati wants to remove Simplicio's difficulties on the actual distinction of essence and being as well as on the notion of the act of being (actus essendi). Feeling that he had skipped stages, he suggests going back to the determination of the exact subject of metaphysics according to Thomas Aquinas. He will progress in two steps: the transition from "first perceived being" to "common being" or "being as being" by a judgment of separation, and then the definition of the subject of metaphysics as "being negatively or neutrally immaterial". With this conclusion, Salviati intends to lead Simplicio to understand the autonomy of the principles of metaphysics towards philosophy of nature. Simplicio remains curious but dubious. (shrink)

The Hegelian and the Thomistic accounts of self-knowledge are solidly Aristotelian in their origins and motivations. In their conclusions and consequences, however, the two accounts exhibit significant differences. Hegel argues that genuine self-knowledge is necessarily social and historical, while Aquinas says nothing about history or society in his account of self-knowledge. The aim of this paper is not to decide the issue concerning historicity in favor of either Hegel or Aquinas. The aim here is rather to address a prior question: (...) what are the systematic and philosophical reasons for the difference between the two thinkers? In order to articulate this difference between the two, we might begin by considering an underlying similarity: their common Aristotelian background. (shrink)

The different meanings of the word "to be" have interested philosophers at least since Aristotle. In my paper, I would like to draw attention to the following question: in what way "to be", when predicating actual existence of an individual, is connected with time and how it refers to the individual and its real change. I want to do this by presenting Thomas Aquinas' interpretation of the Aristotelian analysis of the different means of the word "to be" referring to Peter (...) Geach, who discussed this doctrine in relation to the interpretation of "existence" by Russell and Quine. My aim is to ask whether this medieval doctrine may contribute to the clarification of the relation between unity and time with regard to the question of endurantism and perdurantism. (shrink)

This work includes contributions by grice, pears, strawson, hampshire, williams, buchdahl, gardiner, murdoch, and warnock. the general consensus of opinion seems to be that metaphysics is characterized by being conceptual revision. these philosophers also agree that there is no real future for such metaphysical enquiries. (staff).

In recent years, a considerable amount of interest has arisen in the topic of existential inertia (henceforth EIT) and its relation to the natural theology of Thomas Aquinas. While contemporary Thomists have engaged with proponents of EIT, strangely enough, no literature has focused on Aquinas’s own response to the objection(s) from an EIT-like position. The intention of this article is to (1) lay out the basic thrust of EIT and then (2) articulate how Aquinas’s own metaphysical commitments dissolve the problems (...) that EIT raises. After formulating an argument based on Aqunias’s own texts and paying attention to the metaphysical commitments it involves, I then level three objections and respond to them. (shrink)

It is universally acknowledged that, for St. Thomas, there is a distinction between human persons or supposits and their natures or essences. But it is usually thought that there is no parallel distinction between the angelic person or supposit and its nature. Yet, as this paper argues, Aquinas consistently puts forward just such a distinction. This paper surveys Aquinas’s arguments for the unique identity of God with his essence and the corresponding distinctions between created persons and their essences, showing in (...) the process how the distinction found in angels differs from that found in material substances. It is important to recognize the distinction between supposit and nature in angels not only for its own sake as it touches on his understanding of created persons—human or angelic—but also insofar as it sheds light on Aquinas’s understanding of divine simplicity and of other act-potency compositions in creatures. (shrink)

In this paper, we would like to share a view of Thomas Aquinas’ metaphysics which differs significantly from the “doxa of the act of being” currently widespread among Thomistic philosophers. -/- Nous voudrions faire part ici d’une vision de la métaphysique de Thomas d’Aquin qui diverge sensiblement de la “doxa de l’acte d’être” actuellement répandue parmi les philosophes thomistes.

In recent years, a considerable amount of interest has arisen in the topic of existential inertia (henceforth EIT) and its relation to the natural theology of Thomas Aquinas. While contemporary Thomists have engaged with proponents of EIT, strangely enough, no literature has focused on Aquinas’s own response to the objection(s) from an EIT-like position. The intention of this article is to (1) lay out the basic thrust of EIT and then (2) articulate how Aquinas’s own metaphysical commitments dissolve the problems (...) that EIT raises. After formulating an argument based on Aqunias’s own texts and paying attention to the metaphysical commitments it involves, I then level three objections and respond to them. (shrink)

Boethius identifies God both with esse ipsum and esse suum. This paper explains Boethius's general semantic use of "esse" and the application of this use to God. It questions the helpfulness of attributing to Boethius "existence" words and argues for a more robust role in Boethius’s thought for Hilary of Poitiers’s and Augustine’s exegeses of Exodus 3:14-15 than has been acknowledged in recent scholarship.

In this paper, we would like to share a view of Thomas Aquinas’ metaphysics which differs significantly from the “doxa of the act of being” currently widespread among Thomistic philosophers. -/- Nous voudrions faire part ici d’une vision de la métaphysique de Thomas d’Aquin qui diverge sensiblement de la “doxa de l’acte d’être” actuellement répandue parmi les philosophes thomistes.

What is the distinction between understanding and forming a concept? In my view, for Aquinas, intelligere (the act of understanding) and dicere (the forming of a verbum or mental word) are not two different acts, but simply two different aspects of the same act of understanding. In the following, I will explore more in depth what this distinction means for Aquinas. Firstly, I will give a mostly doctrinal or systematic overview of the issue and, secondly, I will support my claims (...) with relevant textual evidence, taken exclusively from Aquinas’ Summa Theologiae. This study, as an appendix, is part of “The Influence of Kant in Transcendental Thomism: Rahner, Lonergan and Von Balthasar” (forthcoming). In my view, Lonergan’s way of distinguishing intelligere and dicere is different from St. Thomas’ way. In the body of my book, I focus on Lonergan’s reasons to distinguish these notions in his own particular way, whereas this study focuses on St. Thomas’ doctrine. It is my hope that the following lines will foster an understanding of St. Thomas’ epistemology and of its application to Trinitarian theology. (shrink)

Lo studio si pone due domande sulla dottrina dell'essenzialismo, desunta dalla posizione di Avicenna sull'essenza : 1) come fu possibile per gli autori del Due e Trecento interpretare la dottrina aristotelica dell'essenza come dottrina dell'indifferenza dell'essenza all'individualità e all'universalità; 2) come poterono autori che sostenevano dottrine diverse fra loro appellarsi tutti alla risposta di Avicenna. In questo studio è presa in esame la posizione di Tommaso, soprattutto in quanto nell'evoluzione del suo pensiero non dette alla dottrina dell'indifferenza dell'essenza la medesima (...) interpretazione. La prima parte dello studio è centrata sulla dottrina dell'essenza in Avicenna, elaborata sulla scia della distinzione di Alessandro di Afrodisia tra universale e ciò cui l'universale pertiene. Nella seconda si considera la posizione di Tommaso, prima nel De ente et essentia, poi nel Quodlibet VIII, q. 1 delle Quaestiones de quodlibet, infine nei commenti al De anima e alla Metafisica, e nella Summa contra Gentiles. (shrink)

I argue that Thomas Aquinas maintains the view that powers are accidental to their bearers not because powers pertain to bearers with limited essences, but because their bearers have limited actual being. Power tracks not only the essence of something but also its actual existence. Things have powers that are causally relevant when these things exist, that is, the nature of a power is determined by a thing’s essence, but the actual being of the thing of that essence accounts for (...) the limitations of this power and for the extent to which a power can have causal effects.J’interroge dans ce travail le sens dans lequel Thomas d’Aquin estime que les choses dotées de pouvoirs possèdent ceux-ci de manière accidentelle. Cette prise de position s’explique parce que le pouvoir retrace l’existence réelle d’une chose en plus de son essence. Les choses ont des pouvoirs pertinents à l’ordre de la causalité lorsque ces choses-là existent : la nature d’un pouvoir est déterminée par l’essence d’une chose, tandis que l’existence même de la chose ayant cette essence explique les limites de ce pouvoir et la mesure dans laquelle une puissance peut être cause d’effets. (shrink)

Reconciling the permanence of existence with the existence of change is a long-standing metaphysical puzzle. Some, following Aristotle, resolve this tension by positing ‘prime matter’, a bedrock which grounds all change. Saint Thomas Aquinas argued prime matter had to be purely potential, thus completely indeterminate and extensionless. This article charitably reconstructs and critically assesses Aquinas’ view, arguing it is far too restrictive. Prime matter need only be maximally potential and determinable, allowing it to take on certain determinate properties. I argue (...) extension is an obvious candidate property and propose five theories positing extended prime matter: (1) a subtle revision of Aquinas' own view, (2) a hylomorphic approach which attributes to prime matter an ‘elastic’ extension, (3) a minimally/infinitesimally extended prime matter inspired by ancient atomism and late-renaissance/early-modern corpuscularianism, (4) a maximally/infinitely extended prime matter influenced by Advaita Vedanta, and (5) a pluralist approach reminiscent of Aristotle's elements. Crucially, by allowing prime matter a determinate characteristic, each proposal demystifies Thomistic prime matter which one could otherwise charge with being so characterless as to slip into the ‘nothingness’ which terrified the Eleatics and motivated the introduction of prime matter in the first place. (shrink)

Prime Matter Pluralism (PMP) states that while the prime matter of all terrestrial bodies is the same, there is a unique prime matter for each celestial body. Prime matters are distinct in virtue of being in potentiality to different forms. Steven Baldner argues that although Thomas Aquinas endorsed PMP in Summa theologiae I, he ultimately rejected it in his De caelo commentary and De substantiis separatis. Besides exegetical evidence for this claim, Baldner presents a philosophical objection to PMP: according to (...) PMP, distinct prime matters are restricted in their respective potentialities; such restriction requires form, however; therefore, prime matter is not pure potentiality. Since prime matter is pure potentiality, PMP is false. Pace Baldner, I argue that Aquinas endorses PMP as heartily in the later works as in STh I. Moreover, he resisted substantially the same objection to PMP as Baldner’s several times. In particular, Aquinas repeatedly rejected the claim that the restriction of prime matter’s potentiality requires form. In that case, when Aquinas calls prime matter “pure potentiality,” he means that it is formless of itself, not that it is in potentiality to any form whatsoever. (shrink)

Aristotelians traditionally motivate the doctrine of first (“prime”) matter by claiming that substantial change requires a subject. Without gainsaying that motivation, I propose another: first matter is a necessary postulate for the sort of unity proper to a substance. This motivation arises if one examines a claim that Patrick Toner and Robert Koons share: (TM′) the possession of emergent causal powers is necessary for substancehood. I first explain how TM′ represents the application of “Merricks’s Dictum” (“For a macrophysical object to (...) exist is to have causal powers”) to an Aristotelian framework. Next, I argue that, as Toner’s and Koons’s respective theories use TM′, it is incompatible with the denial that substances have substances as proper parts. In Toner’s hylomorphism, TM′ entails that an entity’s matter and form are independent substances. As part of Koons’s theory, TM′ implies that an entity’s elementary parts are substances. Happily, a hylomorphist need not accept TM′. For example, Aquinas rejects TM′ as incompatible with the doctrine of first matter. An ontology like Aquinas’s that includes first matter navigates the dialectical straight between the dualism and atomism. If she commits to first matter, the hylomorphist can deny that substances have substances as proper parts. (shrink)

I wish to prove in this article that Thomas Aquinas was a metaontological pluralist, i.e., that he held that there are many, non-equivalent and irreducible dependence relations in the universe. In this respect, I shall focus on Aquinas' doctrine of the four causes and on the dependence relationships between matter and form in material substances. Subsequently, I shall also reconstruct Aquinas' doctrines by explicitly appealing to metaontological pluralism. I shall explore two routes towards Aquinas' metaontological pluralism: one based on cases (...) of apparent mutual dependence and the other based on the asymmetry of natural priority. Finally, I shall provide two original interpretations of the doctrine of the four causes and of the dependence relationships between matter and form. Such interpretations will be based on the metaphysics of powers. In Section 1 I shall introduce metaontological pluralism and the two routes. In Section 2 I shall examine Aquinas' doctrine of the four causes. In Section 3 I shall provide an interpretation of that doctrine based on powers. In Section 4 I shall consider the dependence relationships between matter and form in material substances. In Section 5 I shall provide an interpretation of such relationships based on powers. (shrink)

The 16th and 17th centuries witnessed a philosophical shift that would help pave the way for modern science, a shift from metaphysical theories of material objects to other views embracing only the empirically-accessible parts of material things. One much-debated topic in the course of this shift was regarding prime matter. The late scholastic Jacobus Zabarella (1533-1589) arrived upon his views about prime matter via his version of the regressus method, a program for a sort of scientific reasoning. In his De (...) rebus naturalibus, Zabarella defends the position that prime matter is extended. However, it is less clear how he accounts for its extension. There is an important text where he apparently suggests that prime matter is extended in and of itself. However, there are two other texts apparently stating that matter is extended in virtue of a distinct accident in the category of quantity. I argue that a decisive reading based solely upon any particular texts is not available. Nevertheless, examining Zabarella’s writing on the topic as a whole, the trajectory of his overall argument is remarkably sympathetic to Averroes, who famously took the accidentally quantified position. Thus, from this systematic feature, the accidentally quantified reading is more reasonable. (shrink)

In this paper I argue that both defence and criticism of the claim that humans act ‘under the guise of the good’ neglects the metaphysical roots of the theory. I begin with an overview of the theory and its modern commentators, with critics noting the apparent possibility of acting against the good, and supporters claiming that such actions are instances of error. These debates reduce the ‘guise of the good’ to a claim about intention and moral action, and in so (...) doing have become divorced from the theory's roots in classical and medieval philosophy. Aristotle and Aquinas’ ‘guise of the good’ is primarily a metaphysical claim resting on the equivalence between actuality and goodness, from which conclusions about moral action are derived. I show the reasoning behind their theory and how it forms the basis for the claims about intention and action at the centre of the modern debate. Finally, I argue that the absence of its original foundation is apparent in recent attacks on the ‘guise of the good’. It is unsurprising that modern action theory and ethics have not always been able to comfortably accommodate the ‘guise of the good’; they are only telling half of the story. (shrink)

Reconciling the permanence of existence with the existence of change is a long-standing metaphysical puzzle. Some, following Aristotle, resolve this tension by positing ‘prime matter’, a bedrock which grounds all change. Saint Thomas Aquinas argued prime matter had to be purely potential, thus completely indeterminate and extensionless. This article charitably reconstructs and critically assesses Aquinas’ view, arguing it is far too restrictive. Prime matter need only be maximally potential and determinable, allowing it to take on certain determinate properties. I argue (...) extension is an obvious candidate property and propose five theories positing extended prime matter: (1) a subtle revision of Aquinas' own view, (2) a hylomorphic approach which attributes to prime matter an ‘elastic’ extension, (3) a minimally/infinitesimally extended prime matter inspired by ancient atomism and late-renaissance/early-modern corpuscularianism, (4) a maximally/infinitely extended prime matter influenced by Advaita Vedanta, and (5) a pluralist approach reminiscent of Aristotle's elements. Crucially, by allowing prime matter a determinate characteristic, each proposal demystifies Thomistic prime matter which one could otherwise charge with being so characterless as to slip into the ‘nothingness’ which terrified the Eleatics and motivated the introduction of prime matter in the first place. (shrink)

It is universally acknowledged that, for St. Thomas, there is a distinction between human persons or supposits and their natures or essences. But it is usually thought that there is no parallel distinction between the angelic person or supposit and its nature. Yet, as this paper argues, Aquinas consistently puts forward just such a distinction. This paper surveys Aquinas’s arguments for the unique identity of God with his essence and the corresponding distinctions between created persons and their essences, showing in (...) the process how the distinction found in angels differs from that found in material substances. It is important to recognize the distinction between supposit and nature in angels not only for its own sake as it touches on his understanding of created persons—human or angelic—but also insofar as it sheds light on Aquinas’s understanding of divine simplicity and of other act-potency compositions in creatures. (shrink)

A lean hylomorphism stands as a metaphysical holy grail. An embarrassing feature of traditional hylomorphic ontologies is prime matter. Prime matter is both so basic that it cannot be examined (in principle) and its engagement with the other hylomorphic elements is far from clear. One particular problem posed by prime matter is how it is to be understood both as a principle of individuation for material substances and as pure potency. I present Thomas Aquinas’s way of squeezing some intelligibility out (...) of prime matter by modeling it on the idea of logical genus. Such a modeling provides insight into understanding prime matter as substratum, as maximally indeterminate, and as ontologically vague. One of the unusual but exciting things that fall out from this analysis of prime matter is the Entirety Thesis: “For any substance x, if x has prime matter then the prime matter of x is the same* as x,” where ‘same*’ is understood as “indeterminately identical.”. (shrink)

In this paper I argue that both defence and criticism of the claim that humans act ‘under the guise of the good’ neglects the metaphysical roots of the theory. I begin with an overview of the theory and its modern commentators, with critics noting the apparent possibility of acting against the good, and supporters claiming that such actions are instances of error. These debates reduce the ‘guise of the good’ to a claim about intention and moral action, and in so (...) doing have become divorced from the theory's roots in classical and medieval philosophy. Aristotle and Aquinas’ ‘guise of the good’ is primarily a metaphysical claim resting on the equivalence between actuality and goodness, from which conclusions about moral action are derived. I show the reasoning behind their theory and how it forms the basis for the claims about intention and action at the centre of the modern debate. Finally, I argue that the absence of its original foundation is apparent in recent attacks on the ‘guise of the good’. It is unsurprising that modern action theory and ethics have not always been able to comfortably accommodate the ‘guise of the good’; they are only telling half of the story. (shrink)

It is universally acknowledged that, for St. Thomas, there is a distinction between human persons or supposits and their natures or essences. But it is usually thought that there is no parallel distinction between the angelic person or supposit and its nature. Yet, as this paper argues, Aquinas consistently puts forward just such a distinction. This paper surveys Aquinas’s arguments for the unique identity of God with his essence and the corresponding distinctions between created persons and their essences, showing in (...) the process how the distinction found in angels differs from that found in material substances. It is important to recognize the distinction between supposit and nature in angels not only for its own sake as it touches on his understanding of created persons—human or angelic—but also insofar as it sheds light on Aquinas’s understanding of divine simplicity and of other act-potency compositions in creatures. (shrink)

In his paper, “Mersenne’s Principles of Song Creation,” Eric Wilkinson (2023) lists several aims he intends to establish. I will confine my comments to two areas only: First, on the reasons given for preferring Aquinas’s theory of the passions as the major influence on Mersenne to those of either Aristotle or Cicero, and Second, on its representation of Aquinas’s theory of the passions.

Edith Stein’s life and thought intersect with many important movements of life and thought in the twentieth century. Through her life and eventual martyrdom, she gave witness to the primacy of truth and faith in the face of political totalitarianism, and in her philosophical works, she contributed to a synthesis of phenomenological thought with the thought of Thomas Aquinas and the living philosophy of Thomism, while also progressively advancing a compelling form of philosophical personalism. As a result, Stein represents one (...) of the most important Catholic thinkers of the twentieth century and is a figure of growing fascination and devotion among believers and nonbelievers alike. The Personalism of Edith Stein is an investigation of Stein’s mature philosophical anthropology, exploring her engagement with the thought of Aquinas and Thomism while maintaining the phenomenological mode of investigation. Through a careful examination of Stein’s later works under the themes of human nature, the human individual, and the human being’s relation to God, the author shows that Stein’s mature personalism is considerably expanded and substantiated by her assimilation of key anthropological and metaphysical teachings of Aquinas and Thomism, and, conversely, that Stein significantly develops and deepens these same teachings through a phenomenological reconsideration of each from a personalist perspective. As a whole, the study reveals the profound accord between Stein’s mature thought and the received teachings of Aquinas, while yet carefully attending to the remaining differences between them. Ultimately, the author proposes that Stein imbues the teachings of Aquinas with a fundamental personalization such that her mature anthropology can be understood as a Thomistically informed personalism which represents a significant, original contribution to the anthropological dimension of the philosophia perennis. (shrink)

q. 16 of John of Naples’ Quodlibet III – Utrum dolor vel passio damnatae animae separatae sit, sicut in subiecto immediato, in eius essentia vel potentia – evokes one of the most delicate debates, both from a theological and philosophical point of view, of scholastic eschatology between the end of the 13th century and the first decades of the 14th: that relating to the action of hellfire (considered, due to the auctoritas of Gregory the Great, corporeal and identical in essence (...) to sublunar fire) on an immaterial reality such as the soul in its state of separation (i.e. in the period between the individual death and the final judgement). The article retraces the way in which (in the well-known q. 2 of Quodlibet VI) John of Naples defends Thomas Aquinas from the suspicion of incurring, with his position, the condemnations of Tempier in 1270 and 1277, and how Aquinas himself tries to explain (especially in q. 26 of his Quaestiones disputatae de veritate) the passio or pain of the soul (both in the state of separation and in that of conjunction), through the double distinction between passio corporalis and passio animalis, and, within the former, between laesio and experimentalis perceptio laesionis. It then analyses q. 16 of Quodlibet III, in which John of Naples identifies the rational appetite – i.e. the will – as the immediate subject of the separate soul’s pain. In the appendix, an edition of John’s question is provided on the basis of the manuscripts Napoli, Biblioteca Nazionale, VII.B. 28 (= N) and Tortosa, Biblioteca de la Catedral, 244 (= T). (shrink)

Thomistic Hylomorphists claim that we human persons have rational or intellective souls which can continue to exist separately from our bodies after we die. Much of the recent scholarly discussion of Thomistic Hylomorphism has centered on this thesis and the question of whether human persons can survive death along with their souls or whether only their souls can survive in this separated, disembodied, post-mortem state. As a result, two rival versions of Thomistic Hyomorphism have been formulated: Survivalism and Corruptionism. This (...) chapter makes a new contribution to the debate between Survivalists and Corruptionists by identifying a heretofore undiscussed problem for Corruptionist Thomistic Hylomorphism. In particular, it is argued that if Corruptionists were right that human persons cannot survive their deaths along with their souls, this would undermine the grounds on which all Thomistic Hylomorphists, including Corruptionists, rely to justify their belief that our souls can continue to exist after our deaths. Given this, it is argued that Thomistic Hylomorphists have grounds for thinking that our souls can continue to exist after our deaths only if they allow, as Survivalists do and Corruptionists do not, that we human persons can continue to exist after our deaths, with souls but no bodies. (shrink)

In this review of Dominik Perler’s book Eine Person sein, Perler’s reconstruction of the relationship between Thomas Aquinas’s unitarist position and his theory of incontinence is analyzed. Perler argues that the unitarist position of Thomas allowes him to conceive of incontinence as a weakness of the whole psychological system of the person. Unlike the mad person, the incontinent has responsibility because she has preserved a degree of rational control. Perler argues that the incontinent person is not responsible for the spontaneous (...) emergence of desire, which is a natural process, only for the way in which she rationally controls it (or not). By analyzing Aquinas’s notion of naturality with respect to desires, I argue that the person is actually responsible for the emergence of a desire, just in case the content of the desire is constituted by a rational choice of end. (shrink)