Guthrie: Tratado 29 (IV, 5) – Psychological Questions — III. About the Process of Vision and Hearing.

FOURTH ENNEAD, BOOK FIVE.
Psychological Questions — III. About the Process of Vision and Hearing.

IT IS UNCERTAIN WHETHER AN INTERMEDIARY BODY BE IMPLIED BY VISION.

REFUTATION OF ARISTOTLE’S INSISTENCE ON A MEDIUM OF SIGHT.

THOUGH THE MEDIUM EXPERIENCE AFFECTION, THE ORGANS FEEL IT BETTER WITHOUT THE MEDIUM.

NECESSITY OF A MEDIUM IN THE THEORIES OF VARIOUS PHILOSOPHERS.

A COSMOLOGICAL MEDIUM IS NECESSARY, BUT IT AFFECTS SIGHT ONLY ACCIDENTALLY.

IMAGES DO NOT REACH US BY EFFLUENCE.

USELESSNESS OF AIR AS TRANSMITTING MEDIUM PROVED FROM SIGHT OF OBJECTS AT NIGHT.

ABSENCE OF MEDIUM WOULD INTERFERE WITH VISION ONLY BY DESTROYING SYMPATHY.

VISION IS NOT DEPENDENT ON THE AFFECTION OF THE MEDIUM.

MUTUAL RELATION OF THE EYE’S LIGHT AND THE OBJECTIVE LIGHT.

INTERMEDIARY LIGHT IS UNNECESSARY. PARTLY BEING AN OBSTACLE.

NOT EVEN THE LIGHT OF THE EYE IS TO BE CONSIDERED AS MEDIUM.

THE OBJECTIVE LIGHT DOES NOT TRANSMIT THE IMAGE BY RELAYS.

NEITHER FOR HEARING IS THE AIR NECESSARY AS A MEDIUM.

THE RELATION OF THE AIR TO THE LIGHT.

DOES THE WITHDRAWAL OF THE LUMINOUS SOURCE ABANDON THE LIGHT TO DESTRUCTION; OR DOES THE LIGHT FOLLOW IT?

LIGHT AS ACTUALIZATION IS THE BEING OF THE LUMINOUS BODY, AND IS INCORPOREAL.

LIFE AND LIGHT DO NOT PERISH. BUT ARE NO MORE THERE.

A WORLD OUTSIDE OF OUR WORLD WOULD NOT BE VISIBLE.

SENSATION IS LIMITED TO COMMON INTEGRAL PARTS OF THE UNIVERSE.

GUTHRIE, K. S. Plotinus: Complete Works: In Chronological Order, Grouped in Four Periods. [single Volume, Unabridged]. [s.l.] CreateSpace Independent Publishing Platform, 2017.