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Pleasure as Perfecting Work
Aristotle
Nicomachean Ethics

The text explains pleasure as a 'supervening finish' that completes an activity when a faculty and its object are perfectly aligned.

...do, being good; just as health and the physician are not in similar senses causes of a healthy state. And that Pleasure does arise upon the exercise of every Percipient Faculty is evident, for we commonly say that sights and sounds are pleasant; it is plain also that this is especially the case when the Faculty is most excellent and works upon a similar Object: and when both the Object and Faculty of Perception are such, Pleasure will always exist, supposing of course an agent and a patient.
Furthermore, Pleasure perfects the act of Working not in the way of an inherent state but as a supervening finish, such as is bloom in people at their prime. Therefore so long as the Object of intellectual or sensitive Perception is such as it should be and also the Faculty which discerns or realises the Object, there will be Pleasure in the Working: because when that which has the capacity of being acted on and that which is apt to act are alike and similarly related, the same result follows naturally.
How is it then that no one feels Pleasure continuously? is it not that he wearies, because all human faculties are incapable of unintermitting exertion; and so, of course, Pleasure does not arise either, because that follows upon the act of Working. But there are some things which please when new, but afterwards not in the like way, for exactly the same reason: that at first the mind is roused and works on these Objects with its powers at full tension; just as they who are gazing stedfastly at...
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Arthur Schopenhauer

The Wisdom of Life

Pleasure in Power

Schopenhauer agrees that pleasure arises from the use of one's faculties and extends the idea by linking the degree of pleasure to the nobility of the power engaged.

...milar athletic pursuits, which sometimes take the form of sport, and sometimes of a military life and real warfare. Thirdly, there are the pleasures of sensibility, such as observation, thought, feeling, or a taste for poetry or culture, music, learning, reading, meditation, invention, philosophy and the like. As regards the value, relative worth and duration of each of these kinds of pleasure, a great deal might be said, which, however, I leave the reader to supply. But every one will see that
The nobler the power which is brought into play, the greater will be the pleasure which it gives; for pleasure always involves the use of one's own powers, and happiness consists in a frequent repetition of pleasure. No one will deny that in this respect the pleasures of sensibility occupy a higher place than either of the other two fundamental kinds; which exist in an equal, nay, in a greater degree in brutes; it is this preponderating amount of sensibility which distinguishes man from other animals.
Now, our mental powers are forms of sensibility, and therefore a preponderating amount of it makes us capable of that kind of pleasure which has to do with mind, so-called intellectual pleasure; and the more sensibility predominates, the greater the pleasure will be.[1] [Footnote 1: Nature exhibits a continual progress, starting from the mechanical and chemical activity of the inorganic world, proceeding to the vegetable, with its dull enjoyment of self, from that to the animal world, where in...

Arthur Schopenhauer

The Wisdom of Life

Intellectual Pleasure's Clarity

Schopenhauer challenges the broad application of Aristotle's claim by asserting that only intellectual pleasure is pure and valuable, while other pleasures are lower, involve pain, and are movements of will, thus questioning whether pleasure always perfects working.

...the world can boast. The highest product of Nature is the clearest degree of consciousness, in which the world mirrors itself more plainly and completely than anywhere else. A man endowed with this form of intelligence is in possession of what is noblest and best on earth; and accordingly, he has a source of pleasure in comparison with which all others are small. From his surroundings he asks nothing but leisure for the free enjoyment of what he has got, time, as it were, to polish his diamond.
All other pleasures that are not of the intellect are of a lower kind; for they are, one and all, movements of will--desires, hopes, fears and ambitions, no matter to what directed: they are always satisfied at the cost of pain, and in the case of ambition, generally with more or less of illusion. With intellectual pleasure, on the other hand, truth becomes clearer and clearer. In the realm of intelligence pain has no power. Knowledge is all in all.
Further, intellectual pleasures are accessible entirely and only through the medium of the intelligence, and are limited by its capacity. For all the wit there is in the world is useless to him who has none. Still this advantage is accompanied by a substantial disadvantage; for the whole of Nature shows that with the growth of intelligence comes increased capacity for pain, and it is only with the highest degree of intelligence that suffering reaches its supreme point.] The normal, ordinary...

Aristotle

Nicomachean Ethics

Pleasure's Productive Power

Aristotle explains the mechanism by which pleasure perfects working: the proper pleasure increases the quality and diligence of the activity, making it more accurate and enduring.

...and Art; as animals, and trees, and pictures, and statues, and houses, and furniture; and so we suppose that in like manner acts of Working which are different in kind are perfected by things differing in kind. Now Intellectual Workings differ specifically from those of the Senses, and these last from one another; therefore so do the Pleasures which perfect them. This may be shown also from the intimate connection subsisting between each Pleasure and the Working which it perfects: I mean, that
The Pleasure proper to any Working increases that Working; for they who work with Pleasure sift all things more closely and carry them out to a greater degree of nicety; for instance, those men become geometricians who take Pleasure in geometry, and they apprehend particular points more completely: in like manner men who are fond of music, or architecture, or anything else, improve each on his own pursuit, because they feel Pleasure in them. Thus the Pleasures aid in increasing the Workings, and things which do so aid are proper and peculiar: but the things which are proper and peculiar to oth...
Yet even more clearly may this be shown from the fact that the Pleasures arising from one kind of Workings hinder other Workings; for instance, people who are fond of flute-music cannot keep their attention to conversation or discourse when they catch the sound of a flute; because they take more Pleasure in flute-playing than in the Working they are at the time engaged on; in other words, the Pleasure attendant on flute-playing destroys the Working of conversation or discourse. Much the same...

Marcus Aurelius

Meditations

Imperfect Beauty

Marcus Aurelius reframes pleasure not as a perfection of activity but as an appreciative stance toward natural processes, finding delight in the inherent beauty of things as they naturally occur, even in decay or irregularity.

...ld live any longer or no, to consider duly; for all such things, wherein the best strength and vigour of the mind is most requisite; his power and ability will be past and gone. Thou must hasten therefore; not only because thou art every day nearer unto death than other, but also because that intellective faculty in thee, whereby thou art enabled to know the true nature of things, and to order all thy actions by that knowledge, doth daily waste and decay: or, may fail thee before thou die. II.
This also thou must observe, that whatsoever it is that naturally doth happen to things natural, hath somewhat in itself that is pleasing and delightful: as a great loaf when it is baked, some parts of it cleave as it were, and part asunder, and make the crust of it rugged and unequal, and yet those parts of it, though in some sort it be against the art and intention of baking itself, that they are thus cleft and parted, which should have been and were first made all even and uniform, they become it well nevertheless, and have a certain peculiar property, to stir the appetite. So figs are acco...
So will he behold with as much pleasure the true rictus of wild beasts, as those which by skilful painters and other artificers are imitated. So will he be able to perceive the proper ripeness and beauty of old age, whether in man or woman: and whatsoever else it is that is beautiful and alluring in whatsoever is, with chaste and continent eyes he will soon find out and discern. Those and many other things will he discern, not credible unto every one, but unto them only who are truly and fami...

Aristotle

Nicomachean Ethics

Habit's Pleasure Test

Aristotle provides practical guidance: use the pleasure or pain that follows actions as a test for moral habit formation. For instance, true self-mastery is shown when one abstains from bodily pleasures with gladness, not reluctance.

...doing plenty of work, and the man who has attained strength is best able to do these: and so it is with the Virtues, for not only do we by abstaining from pleasures come to be perfected in Self-Mastery, but when we have come to be so we can best abstain from them: similarly too with Courage: for it is by accustoming ourselves to despise objects of fear and stand up against them that we come to be brave; and after we have come to be so we shall be best able to stand up against such objects. And
For a test of the formation of the habits we must take the pleasure or pain which succeeds the acts; for he is perfected in Self-Mastery who not only abstains from the bodily pleasures but is glad to do so; whereas he who abstains but is sorry to do it has not Self-Mastery: he again is brave who stands up against danger, either with positive pleasure or at least without any pain; whereas he who does it with pain is not brave. For Moral Virtue has for its object-matter pleasures and pains, because by reason of pleasure we do what is bad, and by reason of pain decline doing what is right (for wh...
Again: since Virtues have to do with actions and feelings, and on every feeling and every action pleasure and pain follow, here again is another proof that Virtue has for its object-matter pleasure and pain. The same is shown also by the fact that punishments are effected through the instrumentality of these; because they are of the nature of remedies, and it is the nature of remedies to be the contraries of the ills they cure. Again, to quote what we said before: every habit of the Soul by its...