We’ve seen how prevalent it was to suppose that the human soul consists of numerous forms, and that many philosophers of the time made human knowledge depend on “illumination” from God. On both issues Aquinas would depart from the consensus.2 He’s having none of these plural forms you’ll find in other theories of soul; or rather, he’s having only one of them. The functions of human life proceed from the single form that he identifies as the rational human soul. To some extent this is just good Aristotelianism, at least as far as Aquinas is concerned. Every substance has a single substantial
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