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This volume considers the contemporary relevance of Aquinas'thought and what parameters should influence its reception. It discusses the reception of Aquinas on creation ex nihilo and offers guidelines for reception in the fields of metaphysics and natural theology. Chapters on physics and philosophy of mind intersect with key modern debates. Contributions interpret Aquinas'physics in light of contemporary findings and discuss his account of human self-awareness.

This author-meets-critics volume about Robert Pasnau's After Certainty treats the history of epistemology, from Aristotle to the present. Pasnau presents this history as a gradual lowering of expectations regarding certain knowledge, the culmination of a sea change dating to the early-modern rejection of Aristotelian essentialism. The result, he concludes, is that contemporary epistemology is, more than any other branch of philosophy, estranged from its tradition. Pasnau's After Certainty draws conclusions that are not just historical, but also systematic, an effort that led to a 2018 Parisian symposium to evaluate the text, collected here as a volume that stands alone as an intriguing work on the history of epistemology or together with After Certainty as an invaluable companion piece.

This volume considers the Aristotelian virtue-ethics tradition as it develops in the writings of Thomas Aquinas. Part One studies the types of virtues Aquinas believes are held by Christians in a state of grace. Aquinas's intriguing account is apparently fraught with inconsistencies, which have split contemporary interpreters over not only how to understand Aquinas on this matter, but also as to whether it is even possible to provide a consistent interpretation of his doctrine. This book brings together scholarship that reflects the various sides of the debate. Part Two explores a Thomistic synthesis regarding Aquinas's account of the good as telos or end that emerges in the seventeenth century, as well as what promise his virtue ethics holds today, arguing that Aquinas'hylomorphic understanding of human beings as matter-form composites furnishes a robust moral accounting that seems unavailable to alternative, reductive materialist accounts.

Mereology is the metaphysical theory of parts and wholes, including their conditions of identity and persistence through change. Hylomorphism is the metaphysical doctrine according to which all natural substances, including living organisms, consist of matter and form as their essential parts, where the substantial form of living organisms is identified as their soul. The theories date to Plato and Aristotle and figure prominently in the history of philosophy up until the seventeenth century, where their influence wanes relative to a reductive materialism that culminates with deflationary accounts of objects and persons, where mere conglomerates constitute things and we are left to account for mental phenomena in terms of the powers of physical materials. In view of such difficulties, there is a renewed interest in hylomorphism, as its forms structure matter and can account for natural kinds, with their various capacities and powers. This volume presents medieval theories of hylomorphism and mereology, articulating the conceptual framework in which they developed and with an eye on their relevance today.

Contemporary introductions to the theme of self-knowledge too often trace its emergence in the history of philosophy to thinkers such as René Descartes and David Hume. Whereas Descartes conceives of self-knowledge as intimate and first-personal, Hume contends that it is limited to our awareness of our impressions and ideas. In point of fact, self-knowledge is a perennial theme. We may, for instance, trace the lineage of Hume and Descartes on these matters to Aristotle and Plato, respectively. This volume studies philosophical treatments of self-knowledge in the Medieval Latin West. It comprises two sets of papers; the first is taken from an author-meets-critics session on Therese Scarpelli-Cory's Aquinas on Human Self Knowledge, which advances the thesis that Aquinas's theory of self-knowledge wherein the intellect grasps itself in its activity bridges the divide between mediated and first-personal self-knowledge. The second set of papers discuss self-knowledge in terms of self-fulfilment. Authors look to Aquinas's account of how we can know when we have acquired the virtues necessary for human happiness, as well as the medieval traditions of mysticism and theology, which offer accounts of transformative self-knowledge, the fulfilment that this brings to our emotional and physical selves, and the authority to teach and counsel about what this awareness confers.

One of the most debated topics in medieval philosophy was the metaphysics of identity—that is, what accounts for the distinctness (non-identity) of different individuals of the same, specific kind and the persistence (self-identity) of the same individuals over time and in different possible situations, especially with regard to individuals of our specific kind, namely, human persons. The first three papers of this volume investigate the comparative development of positions. One problem, considered by William of Auvergne and Albert the Great, deals with Aristotle's doctrine of the active intellect and its relation to Christian philosophical conceptions of personhood. A larger set of issues on the nature and post-mortem fate of human beings is highlighted as common inquiry among Muslim philosophers and Thomas Aquinas, as well as Aquinas and the modern thinker John Locke. Finally, the last two papers offer a debate over Aquinas's exact views regarding whether substances persist identically across metaphysical “gaps” (periods of non-existence), either by nature or divine power.

Moses Maimonides and John Duns Scotus are key figures as regards the thirteenth-century philosophical tradition that developed out of the Western Christian reception of the Neo-Platonized Aristotelianism of Islamic and Jewish thinkers. Whereas the writings of Maimonides count among the received works that inaugurate and shape this span, the variety of conceptual instruments developed by Scotus arguably signal its end, preparing the way for the emergence of diverse fourteenth-century philosophical worldviews. Maimonides on God and Duns Scotus on Logic and Metaphysics explores the eponymous thinkers'work across a variety of fields. In the domain of natural theology, Maimonides presses for creation de novo, adapting from the Islamic Kalām tradition what has come to be known as the Argument from Particularity, which deduces intelligent design when science seems, in principle, unable to account for states of affairs that conceivably needn't obtain (to take an example from modern physics, the strength of the four fundamental forces). Part one of this volume contrasts Maimonides's and Aquinas's parallel treatments of this and other proof strategies still employed by contemporary philosophers. Part two, on Scotus, includes discussion of the authenticity of the logical writings attributed to him, the evolution of his thought in this field against the backdrop of various thirteenth-century developments, the types of Aristotelian universals theorized by Scotus, his semantics of theological discourse and ontology of possible entities.

Metaphysical Themes, Medieval and Modern presents three sets of essays that engage the metaphysics of substance through a study of thought on this theme over the last eight centuries, shedding light on contemporary disputes as well as the history of thought leading into the modern era. Part I grows out of an author-meets-critics panel on Robert Pasnau's Metaphysical Themes: 1274–1671 (OUP, 2011). Pasnau's rich study delves into the four centuries wherein later medieval thought gives way to the modern period. Andrew Arlig reflects on Pasnau's discussion of holenmers, entities such as God and the human soul, that are thought to exist as wholes in more or less disparate things. Paul Symington, on the other hand, treats the substance ontology of Thomas Aquinas in particular through a reflection on Aquinas's understanding of the ontological status of the various modes or accidents of Aristotelian substances. Part II, “Substance Ontology, Medieval and Modern”, transitions to contemporary substance ontology. Travis Dumsday canvasses the field of debate over what is the substratum of change, contending that the Aristotelian, hylomorphic account of substance that views substances as matter-form composites remains the most robust. Gyula Klima, while agreeing with Dumsday's conclusion, strengthens his argument with reference to the development of this bundle of problems within the recent history of analytic philosophy. Dumsday concludes with reflections on the relevance of substance ontology to natural theology, which, in turn, is the theme of Part III, “The Natural Theology of Thomas Aquinas”, wherein Alexander Hall and Michael Sirilla consider how Aquinas's understanding of the divine substance bears on the logic of demonstration in his natural theology, concluding that contemporary Radical Orthodoxy readings that have Aquinas forfeit demonstrative proof that God exists misconstrue him on this point.

Skepticism, Causality and Skepticism about Causality studies the interrelated themes of causality and skepticism in contemporary, early modern and medieval philosophy. Thomas Aquinas's celebrated proofs of the existence of God (the Five Ways of the Summa Theologica) rely in part on an Aristotelian notion of synchronous causality, wherein the things that exist and persist require an accounting that ultimately terminates in the ongoing activity of a first mover, as the existence and persistence of an ecosystem is traceable to the sun. By contrast, in David Hume's early modern account, causality consists in the regularity of successive events (a rolling billiard ball's collision with a stationary one is always followed by the movement of the latter). Moreover, Newtonian and Einsteinian accounts respectively suggest that motion, once initiated, requires no explanation. In light of these developments, the first set of essays in this volume re-evaluates the Aristotelian paradigm and its relation to modern science, contending that in some fields (such as ecology, thermodynamics or information theory) contemporary science still preserves some intuitions about causality that support Aquinas's deliberations.Hume's skepticism about causality is heir to late medieval and early modern development that transformed not only the notion of causality in general, but also the idea of the causal connections between our cognitive faculties, God, and the world in particular, giving rise to extreme, solipsistic forms of skepticism, such as Descartes'Demon skepticism. The second set of essays considers whether Aquinas's thought would be susceptible in some ways to this form of skepticism, and what motivated, just a couple of generations later, the turn to epistemology already involving this sort of skepticism.

Medieval Skepticism, and the Claim to Metaphysical Knowledge presents three sets of essays. The first is an exchange between Antoine Côté and Charles Bolyard over Siger of Brabant's strategy to silence the skeptic by discriminating between nobler and lesser senses and grounding certitude in sense perceptions. Second is another scholarly exchange, between Rondo Keele and Jack Zupko, over what Keele describes as Walter Chatton's attempt to discredit Ockhamist nominalism by means of both an ‘anti-razor', employed by Chatton to prescribe ontological commitment, and an argument strategy based on iteration and infinite regress. The last group of essays explores issues that develop out of the metaphysics of Thomas Aquinas. Joshua Hochschild defends several key positions of Thomistic metaphysics against Anthony Kenny's criticism that Aquinas's treatment of being is inadequate, incoherent or even sophistic. Similarly, David Twetten, after laying out Aquinas's nine versions of the proof for the Real Distinction between essence and esse, suggests one way in which Aquinas could meet the Aristotelian's formidable ‘Question-Begging Objection'. Lastly, Scott M. Williams contends that to preserve God's perfect knowledge of individual material creatures, Aquinas must alter his account of the unintelligibility of prime matter in the individuation of material creatures.

It is supposed to be common knowledge in the history of ideas that one of the few medieval philosophical contributions preserved in modern philosophical thought is the idea that mental phenomena are distinguished from physical phenomena by their intentionality, their directedness toward some object. As is usually the case with such commonplaces about the history of ideas, especially those concerning medieval ideas, this claim is not quite true. Medieval philosophers routinely described ordinary physical phenomena, such as reflections in mirrors or sounds in the air, as exhibiting intentionality, while they described what modern philosophers would take to be typically mental phenomena, such as sensation and imagination, as ordinary physical processes. Still, it is true that medieval philosophers would regard all acts of cognition as characterized by intentionality, on account of which all these acts are some sort of representations of their intended objects.Mental Representation explores the intricacies and varieties of the conceptual relationships between intentionality, cognition and mental representation as conceived by some of the greatest medieval philosophers. The clarification of these conceptual connections sheds new light not only on the intriguing historical relationships between medieval and modern thought on these issues, but also on some fundamental questions in the philosophy of mind as it is conceived today.

This volume presents three sets of papers discussing the medieval problem of singular cognition, nominalist epistemology, and the metaphysics of the great medieval nominalist philosopher, John Buridan. The first group of essays concerns issues surrounding the possibility of singular cognition in light of the cognitive psychology of Thomas Aquinas and Duns Scotus, as well as the latter's “argument from indifference” as developed by William Ockham to support his own, nominalist epistemology. However, Ockham's epistemology, worked out in detail by John Buridan, seems to have implications concerning the possibility of “Demon Skepticism” (later popularized by Descartes), which in turn poses a threat to the consistency of the nominalist cognitive psychology in general, as discussed in the second group of essays. Finally, the third group of essays explores some intriguing, but “weird” implications of the nominalist approach to epistemology in the metaphysics of John Buridan.

For medieval thinkers, the distinction between intentional and extra-mental reality does not precipitate a Kantian turn to the subject. Rather, they allow that metaphysics and natural philosophy study things as they are and leave to logic the investigation of things as conceived. Within this broad scheme, there is much room for debate regarding whether and to what extent Aristotle's categories comprise an accurate picture of what types of things exist. Closely tied to consideration of what types of things exist are questions concerning how language reflects the relations that hold among these things. For instance, both substances and the accidents parasitic on their existence are said to be, but not in the same way.The essays in Categories, and What is Beyond draw on the philosophical traditions of late antiquity and the middle ages to study what types of things there are, the extent to which our knowledge of these entities is accurate, how (and whether) the semantics of analogy are competent to adjust for the difference and diversity found amongst analogates, and some ways in which these considerations bear on our ability to learn and speak of God.

Knowledge, Mental Language, and Free Will traverses the medieval philosophical landscape of metaphysics, logic and natural philosophy. Alexander W. Hall discusses Thomas Aquinas's interpretation of Aristotle's doctrine of per se predication as it occurs in the conclusion of scientific demonstrations, i.e., of arguments producing scientific knowledge in the strict sense. Henrik Lagerlund and Catarina Dutilh Novaes take up medieval studies of mental language in the writings of Peter of Ailly and William Ockham. Works in this genre seek to discern what concepts are concepts of, the ontological status of concepts as entities, and how concepts stand for and represent things in the world. Lastly, Walter Redmond comments on and translates the prologue to and first chapter of the Mexican Jesuit Father Matías Blanco's (d. 1734) The Three-Stranded Cord [Funiculus triplex], where Blanco treats the antinomy between freedom and determination, modal semantics, tense logic and the logical status of counterfactuals in an attempt to reconcile human freedom with God's causality and omniscience.

Saikat Guha (1974–2008) wrote prolifically on many topics. Trained as a philosopher and physicist, Guha was interested in topics ranging from sexual ethics to Bell's Theorem to Anselm's ontological argument to Augustine's persecution of the Donatists—though he was primarily a metaphysician. Guha studied at the University of Texas at Austin, Boise State University, the University of Washington at Seattle, and Syracuse University. He wrote more than one hundred papers from roughly 1997–2006, five of which are published here. Three of these papers reformulate some of Aquinas's key doctrines on God: his first, second, and third ways, and his account of how necessity of being entails absolute perfection. The fourth paper considers whether Ockham's razor requires the presumption of atheism. The fifth paper presents a logical model of the doctrine of the Trinity in order to prove that the doctrine can be understood without logical contradiction.

There is broad agreement in the medieval tradition that we conceive things in the world owing to the transmission of intelligible content through various media that culminates in the concept by which something in the world is cognitively present for us. Yet how the intelligible content is transmitted along with the nature of the ultimate object of cognition provoked ceaseless debate. The first three essays in Universal Representation, and the Ontology of Individuation consider these issues as they play out in the metaphysics and natural philosophy of Avicenna, Averroes, Thomas Aquinas, Ockham and others.The last three essays turn to the metaphysical problem of the nature of the principle of individuation. Moderate realists believe in the existence of immanent general natures such as humanity and equinity, whereby individuals are members of diverse natural kinds. Accordingly, moderate realists such as Aquinas, Henry of Ghent and Duns Scotus need to investigate the nature of the individuating principle by which members of one and the same natural kind differ from one another. Nominalists, for their part, need not concern themselves with any principle of individuation as, for them, all reality is individual, there being no immanent universals; but this release comes at the cost of a new set of epistemological problems.

The Immateriality of the Human Mind, the Semantics of Analogy, and the Conceivability of God brings together the work of experts in the field of medieval philosophy to consider the nature of God and the soul, what can be known of the divine essence and the semantics of theological discourse from the perspectives of medieval theology (both natural and revealed), logic and natural philosophy. In his capacity as an arts master commenting on a work of natural philosophy, Aristotle's De Anima, John Buridan discusses the immateriality of the intellect against the background of the competing, mutually exclusive views of Alexander of Aphrodisias and Averroes. Aquinas takes up the same issue, but in a more properly theological setting, in his Commentary on the Sentences of Peter Lombard, where Aquinas argues that the being of the intellect is independent of matter. Thomas de Vio Cajetan considers the semantics of theological discourse or ‘God talk'in order to derive a proper means to speak of the divine essence in his De Nominum Analogia; and Anselm of Canterbury's Proslogion seeks with unaided reason to develop a single proof whereby those who think seriously of anything as ‘that than which nothing greater can be thought'may know that God exists.

Medieval semantic theories develop out of Aristotle's On Interpretation, in which he notes that “Spoken sounds are symbols of affections in the soul, and written marks symbols of spoken sounds” (tr. J. L. Ackrill, OUP 1984). The medieval commentary tradition elaborates on Aristotle's theory in light of various epistemological and metaphysical commitments, including those entailed by the doctrine of the transcendentals that emerges from the tradition in the writings of Philip the Chancellor (d. 1236). Transcendental attributes such as unity, truth and goodness (properties that figure into most if not all accounts of the transcendentals) characterize every being as such, and hence the doctrine of the transcendentals promised some knowledge of God. This hope, together with the general medieval consensus that the cognitive acts by which we grasp extra-mental entities are veridical (i.e., in most cases, these acts represent what the cognizing subject takes them to represent) encouraged medieval thinkers to devote considerable effort to discerning how concepts latch onto reality. Medieval Metaphysics, or Is It “Just Semantics”? follows these attempts as concerns the signification of theological discourse in general and Trinitarian semantics in particular, the proper object of the intellect, and what is signified through quidditative or essential definition.