Porphyry (philosopher): Thing

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Auxiliaries to the Perception of Intelligible Natures
Context: Things essentially incorporeal, because they are more excellent than all body and place, are every where, not with interval, but impartibly.
Things essentially incorporeal are not locally present with bodies but are present with them when they please; by verging towards them so far as they are naturally adapted so to verge. They are not, however, present with them locally, but through habitude, proximity, and alliance.
Things essentially incorporeal, are not present with bodies, by hypostasis and essence; for they are not mingled with bodies. But they impart a certain power which is proximate to bodies, through verging towards them. For tendency constitutes a certain secondary power proximate to bodies.