Like a reliable pizzeria, Aquinas’ theory delivers what it promises, by securing the unity of the soul where form pluralism would give us only an aggregate or “heap” (DQS 11 resp). What we loosely refer to as lower “souls,” responsible for things like digestion and sensation, are mere capacities within the single form that is the rational soul. Thus far he is endorsing the position that Kilwardby will condemn at Oxford. Aquinas wants to go further still, though. He insists that the soul is the only substantial form to be found in each human. It is predicated directly of prime matter, rather
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