On Separate Substances
A late treatise on the angels (the substantiae separatae) — their existence, nature, hierarchy, and operations. Aquinas's first survey of pagan-philosophical and patristic teaching on the angels before establishing his own position.
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Source: English translation by Francis J. Lescoe (West Hartford, 1959), revised by the Aquinas Institute. Mirrored from aquinas.cc. · Latin text from the Leonine / Marietti editions (public domain), mirrored from aquinas.cc.