On the Hidden Activities of Nature
A short letter on the natural-philosophical question of occult or hidden powers in natural things (e.g. the magnet) — Aquinas distinguishes natural causes from demonic interference.
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Source: English translation by Joseph B. McAllister, revised by the Aquinas Institute. Mirrored from aquinas.cc. · Latin text from the Leonine / Marietti editions (public domain), mirrored from aquinas.cc.