Here is another of the scholastic manuals I pulled off my shelf: Fernand van Steenberghen, Ontology (Nauwelaerts Publisher, Brussels, 1970, tr. Moonan). A paragraph from p. 278 supports my thesis that the distinction between primary substance and suppositum is an ad hoc device invented for a theological purpose, a device for which there is no independent philosophical warrant:
4. The problem of subsistence or personality. This problem was inserted into metaphysics for the benefit of theology, as is quite plain, in order to prepare the way for a satisfactory explanation of the theological mystery of the incarnation, the question of knowing how and why the human nature of Jesus Christ does not constitute a human person. But this problem is extraneous to philosophy and must remain so, for from the metaphysical point of view, there is no reason for distinguishing individual nature and individual. It is therefore contrary to any sane method to ask in ontology on what conditions an individual nature might not be a suppositum (or person, where it is an intelligent nature that is in question.)
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