Book 3 · Section 116

XXXIX. (116) If therefore you shall ever inquire, O my mind, what situation has been assigned to pleasure, do not take into your consideration the parts about the head, where the reasoning faculties of man have their abode, for you will not find it there; since reason is at war with passion, and cannot possibly remain in the same place with it. For the moment that reason gets the upper hand pleasure is discarded; but as soon as ever pleasure prevails, reason is put to flight. But seek first rather in the breast and in the belly, where courage and anger, and appetite abide, all which are parts of the irrational faculties. For it is there that our judgment is discovered, and also our passions. (117) Therefore, the mind is not hindered by any external force from abandoning the legitimate objects of its attention, which can only be perceived by the intellect, and surrendering itself to those which are worse; but still this never happens except when there is a war in the soul, for then indeed it follows of necessity that reason must fall under the power of the inferior part of man, inasmuch as it is not of a warlike character, but is fond of peace.