Essays And Fragments Of Proclus The Platonic Successor

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IF with respect to light, one kind is material, but another immaterial, according to the difference of those illuminating natures, fire and the sun, the light which in immaterial is, in a certain respect, corrupted; but material light, in a certain respect, pervades through material substances: for the whole air appears to be no less illuminated by the sun than by the fire that is procured by us.