What is the nature of the material world? And how are its fundamental constituents to be described? These questions are of central concern to contemporary philosophers, and in their attempt to answer them, they have begun reconsidering traditional views about metaphysical structure, including the Aristotelian view that material objects are best described as 'hylomorphic compounds'--that is, objects composed of both matter (hyle) and form (morphe). In this major new study, Jeffrey E. Brower presents and explains the hylomorphic conception of the material world developed by Thomas Aquinas, the most influential Aristotelian of the Middle Ages. According to Brower, the key to understanding Aquinas's conception lies in his distinctive account of intrinsic change. Beginning with a novel analysis of this account, Brower systematically introduces all the elements of Aquinas's hylomorphism, showing how they apply to material objects in general and human beings in particular. The resulting picture not only sheds new light on Aquinas's ontology as a whole, but provides a wholesale alternative to the standard contemporary accounts of material objects. In addition to presenting and explaining Aquinas's views, Brower seeks wherever possible to bring them into dialogue with the best recent literature on related topics. Along the way, he highlights the contribution that Aquinas's views make to a host of contemporary metaphysical debates, including the nature of change, composition, material constitution, the ontology of stuff vs. things, the proper analysis of ordinary objects, the truthmakers for essential vs. accidental predication, and the metaphysics of property possession.

What is the nature of the material world? And how are its fundamental constituents to be described? These questions are of central concern to contemporary philosophers, and in their attempt to answer them, they have begun reconsidering traditional views about metaphysical structure, including the Aristotelian view that material objects are best described as 'hylomorphic compounds'—that is, objects composed of both matter (hyle) and form (morphe). In this major new study, Jeffrey E. Brower presents and explains the hylomorphic conception of the material world developed by Thomas Aquinas, the most influential Aristotelian of the Middle Ages. According to Brower, the key to understanding Aquinas's conception lies in his distinctive account of intrinsic change. Beginning with a novel analysis of this account, Brower systematically introduces all the elements of Aquinas's hylomorphism, showing how they apply to material objects in general and human beings in particular. The resulting picture not only sheds new light on Aquinas's ontology as a whole, but provides a wholesale alternative to the standard contemporary accounts of material objects. In addition to presenting and explaining Aquinas's views, Brower seeks wherever possible to bring them into dialogue with the best recent literature on related topics. Along the way, he highlights the contribution that Aquinas's views make to a host of contemporary metaphysical debates, including the nature of change, composition, material constitution, the ontology of stuff vs. things, the proper analysis of ordinary objects, the truthmakers for essential vs. accidental predication, and the metaphysics of property possession.

Oxford Studies in Medieval Philosophy showcases the best new scholarly work on philosophy from the end of antiquity into the Renaissance. OSMP combines historical scholarship with philosophical acuteness, and will be an essential resource for anyone working in the area.

In our daily lives, we are surrounded by all sorts of things – such as trees, cars, persons, or madeleines – and perception allows us access to them. But what does ‘to perceive’ actually mean? What is it that we perceive? How do we perceive? Do we perceive the same way animals do? Does reason play a role in perception? Such questions occur naturally today. But was it the same in the past, centuries ago? The collected volume tackles this issue by turning to the Latin philosophy of the 13th and 14th centuries. Did medieval thinkers raise the same, or similar, questions as we do with respect to perception? What answers did they provide? What arguments did they make for raising the questions they did, and for the answers they gave to them? The philosophers taken into consideration are, among others, Albert the Great, Roger Bacon, William of Auvergne, Thomas Aquinas, Duns Scotus, John Pecham, Richard Rufus, Peter Olivi, Robert Kilwardby, John Buridan, and Jean of Jandun. Contributors are Elena Băltuță, Daniel De Haan, Martin Klein, Andrew LaZella, Lukáš Lička, Mattia Mantovani, André Martin, Dominik Perler, Paolo Rubini, José Filipe Silva, Juhana Toivanen, and Rega Wood.

Anthony J. Lisska presents a new analysis of Thomas Aquinas's theory of perception. While much work has been undertaken on Aquinas's texts, little has been devoted principally to his theory of perception and less still on a discussion of inner sense. The thesis of intentionality serves as the philosophical backdrop of this analysis while incorporating insights from Brentano and from recent scholarship. The principal thrust is on the importance of inner sense, a much-overlooked area of Aquinas's philosophy of mind, with special reference to the vis cogitativa. Approaching the texts of Aquinas from contemporary analytic philosophy, Lisska suggests a modest 'innate' or 'structured' interpretation for the role of this inner sense faculty. Dorothea Frede suggests that this faculty is an 'embarrassment' for Aquinas; to the contrary, the analysis offered in this book argues that were it not for the vis cogitativa, Aquinas's philosophy of mind would be an embarrassment. By means of this faculty of inner sense, Aquinas offers an account of a direct awareness of individuals of natural kinds—referred to by Aquinas as incidental objects of sense—which comprise the principal ontological categories in Aquinas's metaphysics. By using this awareness of individuals of a natural kind, Aquinas can make better sense out of the process of abstraction using the active intellect (intellectus agens). Were it not for the vis cogitativa, Aquinas would be unable to account for an awareness of the principal ontological category in his metaphysics.

Anthony Kenny offers a critical examination of a central metaphysical doctrine of Thomas Aquinas, the greatest of the medieval philosophers. Aquinas's account of being is famous and influential: but Kenny argues that it in fact suffers from systematic confusion. Because of the centrality of the doctrine, this has implications for other parts of Aquinas's philosophical system: in particular, Kenny shows that the idea that God is pure being is a hindrance, not a help, to Aquinas's natural theology. Kenny's clear and incisive study, drawing on the scholastic as well as the analytic tradition, dispels the confusion and offers philosophers and theologians a guide through the labyrinth of Aquinas's ontology.

This Element is a survey of central topics in the metaphysics of material objects. The topics are grouped into four problem spaces. The first concerns how an object's parts are related to the object's existence and to the object's nature, or essence. The second concerns how an object persists through time, how an object is located in spacetime, and how an object changes. The third concerns paradoxes about objects, including paradoxes of coincidence, paradoxes of fission, and the problem of the many. The fourth concerns views with radical consequences regarding the existence of composite material objects, including mereological nihilism, ontological anti-realism, and deflationism.