Joseph P. Li Vecchi

In this article Quine's program for reducing ontology to the semantic level is compared to Aquinas' metaphysical ontology. Some internal inconsistencies of Quine's quantificational account of existence are discussed. Aquinas' account of existence is explicated in response to Quine' mischaracterization of Scholastic ontology. The general nature of an amended logical account of existence incorporating Aquinas' ontological categories is indicated. Finally, recent attempts to harmonize Thomism and analytic philosophy are criticized for failing to note that the quantificational account of existence is motivated by analytic philosophy's rejection of metaphysical ontology. Nothing short of a logical account of existence within the broader framework of the philosophy of being can legitimate the efforts of analytical Thomists.

This article identifies and formalizes the logical features of analogous terms that justify their use in deduction. After a survey of doctrines in Aristotle, Aquinas, and Cajetan, the criteria of “analogy of proper proportionality” are symbolized in first-order predicate logic. A common genus justifies use of a common term, but does not provide the inferential link required for deduction. Rather, the respective differentiae foster this link through their identical proportion. A natural-language argument by analogy is formalized so as to exhibit these criteria, thereby showing the validity of analogical deduction.

The Fregean tradition promotes a conception of logic as being independent from all psychological acts of the knowing subject. Without questioning logic's status as a paradigm of objectivity the present essay rejects this conception, both on logical grounds and in light of the scholastic theory of intentionality. Finding fault with two key doctrines of the analytic movement, the linguistic turn and anti-psychologism, it reinterprets them to exclude only psychological acts that engender subjective interpretive variability. It then describes logic's dependence on non-interpretive psychological acts that ensue as a natural result of objects being apprehended by the intellect. These acts, which Hervaeus Natalis and the scholastic tradition thematize as the imposition of second intentional relations of reason, dictate the logically coherent parameters of logical objectivity.

The deductive validity of arguments from analogy is formally demonstrable. After a brief survey of the historical development of doctrines relevant to this claim the present article analyzes the “analogy of proper proportionality”, which meets two requirements of valid deduction. First, the referents of analogues by proportionality must belong to a common genus. Here it must be cautioned, however, that the common genus does not constitute the basis of the deductive inference. Rather, it is a prerequisite for the second and decisive requirement, that the different logical content to which an analogous middle term corresponds must exhibit the same proportional relation to this common genus. In Section II I translate a natural language argument with such an analogous middle term into the language of classical first-order predicate calculus, and show that its conclusion follows from its premises with the force of deductive necessity. The rule of inference justifying the analogical entailment of the conclusion from the premises functions much like the familiar modus ponens rule, and could be called “modus ponens analogice”. The validity of this rule ought to be judged on the same basis as that of the traditional modus ponens rule – immediate logical intuition. The present article endeavors to facilitate this logical intuition by making the logical structure of inference by analogy formally explicit.

This book provides a discussion of the philosophy of being according to three major traditions in Western philosophy, the Analytic, the Continental, and the Thomistic. The origin of the point of view of each of these traditions is associated with a seminal figure, Gottlob Frege, Immanuel Kant, and Thomas Aquinas, respectively. The questions addressed in this book are constitutional for the philosophy of being, considering the meaning of being, the relationship between thinking and being, and the methods for using thought to access being. On the one hand, the book honors diversity and pluralism, as it highlights how the three traditions may be clearly and distinctly differentiated regarding the philosophy of being. On the other hand, it honors a sense of solidarity and ecumenism, as it demonstrates how the methods and focal points of these traditions constitute, and continue to shape, the development of Western philosophy. This book contributes toward an essential overview of Western metaphysics and will be of particular interest to those working in the history of philosophy and in the philosophy of being.

A fruitful comparison of Aquinas and contemporary philosophy on the nature of human consciousness ought to take stock of the different ontological and epistemological presuppositions of the theories compared. Thomists of an analytic bent such as Richard Cross and John O'Callaghan often forgo an adequate account of the epistemic motivation of Aquinas’ hylomorphism, and of its impact on his theory of consciousness. In the spirit of identifying systemic obstacles to reconciling Aquinas and contemporary cognitive philosophy, this article shows that Aquinas' theory of form and matter is key to understanding why there is no mind-body dualism in his anthropology. Moreover, it draws attention to the essential role that Aquinas ascribes to the appetitive faculty in human cognition. Aquinas' theory of consciousness can contribute to contemporary cognitive philosophy only on condition of an appropriation of these aspects of his theory.