"Other views of man's nature, such as interactionism, epiphenomenalism, the dual-aspect theory, parallelism, occasionalism, and preestablished harmony, are attempts to come to grips, but without success, with the great problems emerging from treating the human body and the human soul as two different things (see SOUL-BODY RELATIONSHIP). In the Aristotelian-Thomist account, the soul is not one thing and the body another. Neither is a thing at all. The man is the thing, the one thing, with a soul related to the body as the body's first actuality."

BRADY, I. C., et al. "Soul, Human." New Catholic Encyclopedia, 2nd ed., vol. 13, Gale, 2003, pp. 336-353. Gale eBooks, link.gale.com/apps/doc/CX3407710560/GVRL?u=morenetrockhrst&sid=bookmark-GVRL&xid=8e6f8ac0. Accessed 2 Sept. 2022.