Book X of Aristotle’s Nicomachean Ethics returns to “pleasure” after Book VII, and in the fourth chapter he asks what it is and how it relates to “activity”. He compares it to “the bloom of youth” and takes up the question why no one is “continuously pleased”. The passage stands under this term as his account of pleasure as an end that “supervenes” upon activity.
Read in contextPleasure completes the activity not as the corresponding permanent state does, by its immanence, but as an end which supervenes as the bloom of youth does on those in the flower of their age. So long, then, as both the intelligible or sensible object and the discriminating or contemplative faculty are as they should be, the pleasure will be involved in the activity; for when both the passive and the active factor are unchanged and are related to each other in the same way, the same result naturally follows.
How, then, is it that no one is continuously pleased? Is it that we grow weary? Certainly all human beings are incapable of continuous activity. Therefore pleasure also is not continuous; for it accompanies activity. Some things delight us when they are new, but later do so less, for the same reason; for at first the mind is in a state of stimulation and intensely active about them, as people are with respect to their vision when they look hard at a thing, but afterwards our activity is not of this kind, but has grown relaxed; for which reason the pleasure also is dulled.
