This paper aims to demonstrate whether Aquinas’s concept of “common being” (ens commune), as it emerged widely among scholastic metaphysicians, provides a theoretical basis for being reconciled with the concept of “the highest genus of all” (genus omnium supremum). The main focus of this study is to understand the underlying resemblance of these concepts, based on Aquinas’s selected works, both the In Metaphysicam Aristotelis and In Librum Beati Dionysii De Divinis Nominibus. The Author proposes either an analytical reconstruction or a metaphysical lens for examining this topic, presenting additional approaches to the study of ens commune. The correlation between ens commune and genus omnium supremum seems quite plausible, though in certain respects. It is generally accepted that Aquinas’s ens commune refers exclusively to the abstracted concept of common being, encompassing all real beings in terms of existence (secundum esse), while genus omnium supremum would be a broader and still higher concept, encompassing all varieties of beings, even those of the intentional order (secundum rationem). It seems likely that Aquinas’s Commentaries may convincingly reveal that the concept of ens commune has a broader scope than merely referring to diverse real beings and their properties. Arguing in favor of this thesis, the Author strives to demonstrate that the concept of ens commune corresponds to all beings considered from a cognitive perspective, not only the existential one, but also a perspective covering all denominations of being in whatever form of their existence, namely combining both real being (ens reale) and being of reason (ens rationis) into one, unique, intelligible concept.
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