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Sacred Texts: The Classics

The Enneads of Plotinus: THE FOURTH ENNEAD: FIFTH TRACTATE: Section 4

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4. But there is the question of the linked light that must relate the visual organ to its object. Now, firstly: since the intervening air is not necessary- unless in the purely accidental sense that air may be necessary to light- the light that acts as intermediate in vision will be unmodified: vision depends upon no modification whatever.