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polytropos
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A soul is just a form of a living thing. All forms are “immaterial” in the sense that it is not the “material cause” of a thing. But (since all forms are not matter by definition) that is not the relevant sense of “material” when one says that a soul is material or immaterial.I am not at all sure what the word “immaterial” means here. Or rather, what do you mean by a “material soul” - a soul by definition stands in opposition to “matter” as a co-principle of existant material substances Therefore a “material soul” is a contradiction in terms..
A soul is said to be immaterial just in case its highest essential function is immaterial. Most animals do not have any highest essential function, so their souls are material. (This includes vegetation and animals with only “appetitive” souls.) The Aristotelian claims further that humans have rational souls and that the rational power is “higher” that the other functions (since, in the order of nature, rational powers entail vegetative and appetitive powers, but the opposite is not true). If the Aristotelian/Thomist can establish that “the intellect has no bodily organ” (as the Ross article, for instance, attempts to do), then he claims that the soul is “immaterial” since its highest function is immaterial in operation. (This does not preclude that the soul is naturally associated with matter and depends on matter for its normal functioning.)
A couple points:Where is the soul these days in the allegedly circular motion of the super lunar bodies that both Aristotle (and even Aquinas) posited had to exist? We can explain that mechanisticly so “poof” their souls no longer are credible to us. I don’t think any modern Aristotelian or Thomist would still be pushing that these days would they?
- I don’t think super lunar bodies were taken to be alive, so their forms would not have been called souls. (Though I may be wrong on this.)
- We can’t exactly explain the motion of heavenly bodies. We can describe and project them with Kepler’s laws (for instance) and more nuanced models. We know that gravity and inertia play a role in their continued orbit. We have some tentative explanations of gravity (the curvature of space-time). But until we have some sort of quantum gravity theory that unifies relativity with quantum mechanics, most of what we have are mathematical models, which when grouped with quantum theory, we know must be in some way incorrect and in need of modification.
- Souls are not posited in the Aristotelian tradition to account for unexplained phenomena. Whether something has a material explanation currently has no relevance to whether an Aristotelian will posit that it has a form. (Consider my previous example of the growth of a tree. Suppose that we have complete biological knowledge of such a species of tree. We still posit a form for it.) To posit a form is not to claim that phenomena do not have underlying causes. A form-matter ontology is selected for separate reasons (a more robust theory of knowledge, a better solution to the problem of universals, and a better solution to the problem of unity/individuation). We then just apply it to all substances we encounter.
- You are correct that contemporary Thomists don’t argue anything odd about heavenly bodies, or at least I have not seen anything in the writings of Oderberg, Anscombe, Geach, Haldane, Klima, Feser, or Ross, or any other Aristotelian/Thomist. So evidently, whatever Aristotle and Aquinas argued about the heavenly bodies is not in fact essential to the Thomist system.
Again, this is a false dichotomy. Positing a form (or a power essential to that form) is not inconsistent with having a full material explanation of a phenomenon.Once the false philosophic assumptions they were working from have been exposed it isn’t too hard to extrapolate to vegetation or even animals and suggest that locomotion is purely mechanical in explanation. Of course a spiritual principle (or a separate final cause) may be needed to explain the chain of causality that started the locomotion. But efficient and material and formal causes of locomotion seem adequately explained at the sensible level without recourse to an inferred spiritual substance?