Full Idea
Being everywhere and nowhere, the incorporeal, wherever it happens to be, betrays its presence only by a certain kind of disposition.
Gist of Idea
The presence of the incorporeal is only known by certain kinds of disposition
Source
Porphyry (Launching Points to the Realm of the Mind [c.280], 4Enn3 21(20))
Book Reference
Porphyry: 'Launching Points to the Realm of the Mind', ed/tr. Guthrie,Kenneth [Phanes 1988], p.41
A Reaction
There is a mystical or dualist view of fundamental powers, as the spiritual engine which drives passive physical nature. It's rubbish of course, but if powers are primitive in a naturalistic theory, it is not a view which can be refuted.