Enneads IV.4: Questions About the Soul
Does the Irascible Power Also Originate in the Body?
28. Enough of this. Let us return to the question from which we digressed. We granted that the desires, pains and pleasures (considered not only as sentiments, but as passions), originate in the constitution of the organized and living body. Must the same origin be assigned to the irascible (power)? Were this so, we would have several questions to ask: Does anger belong to the entire organism, or only to a particular organ, such as the heart when so disposed, or to the bile, as long as it is part of a living body? Is anger different from the principle which gives the body a trace of the soul, or is it an individual power, which depends on no other power, whether irascible or sensitive?
THE LIVER IS THE SEAT OF THE SOUL'S FACULTY OF DESIRE.
The vegetative power present in the whole body communicates to every part thereof a trace of the soul. It is therefore to the entire body that we must refer suffering, pleasure, and the desire of food. Though nothing definite is ascertained about the seat of sexual desire, let us grant that their seat is in the organs destined to its satisfaction. Further, be it granted that the liver is the seat of the soul's faculty of desire, because that organ is particularly the theatre of the activities of the vegetative power which impresses a trace of the soul on the body; and further, because it is from the liver that the action it exercises starts.