This tractate explores the connection between the body and the Soul, focusing on the question of where emotions and experiences reside. Basically, determining whether emotions like fear and courage are experienced by the Soul or by the physical body.
Plotinus establishes that the Soul is immortal, and since it cannot be threatened by the physical danger, it cannot be the source of these emotional states.
Now what could bring fear to a nature thus unreceptive of all the outer? Fear demands feeling. Nor is there a place for courage: courage implies the presence of danger. And such desires as are satisfied by the filling or voiding of the body, must be proper to something very different from the Soul, to that only which admits of replenishment and voidance.
Plotinus then goes on to argue that humans possess what he terms the Animate, which is essentially a combination of a physical body with the immortal Soul.
Now this Animate might be merely the body as having life: it might be the Couplement of Soul and body: it might be a third and different entity formed from both.
Plotinus later explores the question of perception, inquiring into whether the Soul can perceive things in the physical realm. He posits that the Soul perceives sympathetically, essentially picking up reverberations from what the body experiences on the physical plane.
The faculty of perception in the Soul cannot act by the immediate grasping of sensible objects, but only by the discerning of impressions printed upon the Animate by sensation: these impressions are already Intelligibles while the outer sensation is a mere phantom of the other [of that in the Soul] which is nearer to Authentic-Existence as being an impassive reading of Ideal-Forms.
Based upon this quote, it appears that the Soul, being divine in origin and immortal, has direct knowledge of the Platonic forms. The Soul thereby is able to identify the sensations from the physical world because of their connection to the ideals existing within the realm of forms. This reminds me of how, in music, a string will vibrate when a note of the same key is played on a different string. For example, if you play a D note on the A string, the D string will also vibrate.
That’s all I have for this tractate. We will look at the next one soon.