This forth of the six Enneads (ΕΝΝΕΑΔΕΣ) written by Plotinus (ΠΛΩΤΙΝΟΣ); arranged by Porphyry (ΠΟΡΦΥΡΙΟΣ) and translated by Kenneth Sylvan Guthrie contains the following nine books:

1. Of the Being of the Soul (0:00:00)

2. How the Soul Mediates Between Indivisible and Divisible Essence (0:02:59)

3. Are Not All Souls Parts or Emanations of a Single Soul? (0:18:57)

4. Questions About the Soul (2:27:04)

5. About the Process of Vision and Hearing (5:31:10)

6: Of Sensation and Memory (6:14:53)

7. Of the Immortality of the Soul (6:31:27)

8. Of the Descent of the Soul Into the Body (7:47:49)

9. Whether All Souls Form a Single One (8:24:55)

Painting: The Virgin Adoring the Host by Jean Auguste Dominique Ingres, 1852.