I have written a fair amount on the angelology of St. Thomas Aquinas. But I haven’t yet delved much into demonology, though Aquinas has quite a bit to say about that subject in the Summa Theologiae (I, Q. 63-64). Fortunately, Aquinas asked many questions that come to my mind, and maybe yours, too. So, herewith, a few of them, with possible answers:
Q: Devils, as pure spirits, don’t make choices like humans: For example, “Oh, if only I knew what the consequences would be!” The angels had the initial choice of siding with God, or not. They had a clear understanding of

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