Notes on Thomistic Concepts on the Structure of Reality

I thought I’d reblog this glossary of key scholastic terms for easy access as I continue to read up on the metaphysics of Aquinas. And perhaps readers may find it helpful, too.

Luminous Darkness

St. Thomas Aquinas from  by Carlo CrivelliThis is a summary of some key concepts for the understanding of the Thomistic theological constructs for the structure of reality and being.

Substance

In Aristotle, there are two senses of substance: the “first substance” is a whole, concrete entity – this horse, this man. The second sense, or “second substance” refers to quiddity – horse, man.

First substance refers to a being or an entity subsisting or existing in itself, not in another being like an accident. This is a metaphysical category; e.g., God, angels, human beings.—not physical, chemical substance. It is the basic ontological unit, a complete, individual whole, a determinate, particular subject of existing and acting, e.g., this tree, this human being, Tom, Mary, etc. It is the proper subject of existence, “that which exists [quod est],” not “that by which something exists [quo est]”

This is the first “category” of Aristotle’s ten categories or predicaments, the…

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