Enneads III.6: Of the Impassibility of Incorporeal Entities (Soul and and Matter)
Virtue as a Harmony; Vice as a Disharmony
2. What occurs in the soul when she contains a vice? We ask this because it is usual to say, "to snatch a vice from the soul;" "to introduce virtue into her," "to adorn her," "to replace ugliness by beauty in her." Let us also premiss, following the opinions of the ancients,[30] that virtue is a harmony, and wickedness the opposite. That is the best means to solve the problem at issue. Indeed, when the parts of the soul (the rational part, the irascible part, and the part of appetite), harmonize with each other, we shall have virtue;[31] and, in the contrary case, vice. Still, in both cases, nothing foreign to the soul enters into her; each of her parts remain what they are, while contributing to harmony. On the other hand, when there is dissonance, they could not play the same parts as the personnel of a choric ballet, who dance and sing in harmony, though not all of them fill the same functions; though one sings while the remainder are silent; and though each sings his own part; for it does not suffice that they all sing in tune, they must each properly sing his own part. In the soul we therefore have harmony when each part fulfils its functions. Still each must have its own virtue before the existence of a harmony; or its vice, before there is disharmony. What then is the thing whose presence makes each part of the soul good or evil? Evidently the presence of virtue or vice. The mere statement that, for the rational part (of the soul) vice consists in ignorance,[32] is no more than a simple negation, and predicates nothing positive about reason.
THIS DEFINITION SUFFICES TO EXPLAIN THE FACTS OF EVIL IN THE SOUL.
But when the soul contains some of those false opinions which are the principal cause of vice, must we not acknowledge that something positive occurs in her, and that one of her parts undergoes an alteration? Is not the disposition of the soul's irascible part different according to its courage or cowardliness? And the soul's appetitive-part, according to whether it be temperate or intemperate? We answer that a part of the soul is virtuous, when it acts in conformity with its "being," or when it obeys reason; for reason commands all the parts of the soul, and herself is subjected to intelligence. Now to obey reason is to see; it is not to receive an impression, but to have an intuition, to carry out the act of vision.[33] Sight is of the same (nature) when in potentiality, or in actualization; it is not altered in passing from potentiality to actualization,[34] she only applies herself to do what it is her (nature) to do, to see and know, without being affected. Her rational part is in the same relation with intelligence; she has the intuition thereof.[35] The nature of intelligence is not to receive an impression similar to that made by a seal, but in one sense to possess what it sees, and not to possess it in another; intelligence possesses it by cognizing it; but intelligence does not possess it in this sense that while seeing it intelligence does not receive from it a shape similar to that impressed on wax by a seal. Again, we must not forget that memory does not consist in keeping impressions, but is the soul's faculty of recalling and representing to herself the things that are not present to her. Some objector might say that the soul is different before reawakening a memory, and after having reawakened it. She may indeed be different, but she is not altered, unless indeed, we call the passing from potentiality to actualization an alteration. In any case, nothing extraneous enters into her, she only acts according to her own nature.
ONLY THE PHYSICAL ORGANS, NOT THE IMMATERIAL NATURES, COULD BE AFFECTED.
In general, the actualizations of immaterial (natures) do not in any way imply that these (natures) were altered--which would imply their destruction--but, on the contrary, they remain what they were. Only material things are affected, while active. If an immaterial principle were exposed to undergo affections, it would no longer remain what it is. Thus in the act of vision, the sight acts, but it is the eye that is affected. As to opinions, they are actualizations analogous to sight.