Thomas Aquinas

“ The reason why pleasure is not sought for the sake of something else is because it is repose in the end. Now the end may be either good or evil; although nothing can be an end except in so far as it is good in respect of such and such a man: and so too with regard to pleasure.
Reply to Objection 3: All things seek pleasure in the same way as they seek good: since pleasure is the repose of the appetite in good. But, just as it happens that not every good which is desired, is of itself and verily good; so not every pleasure is of itself and verily good. ”

“ The temperate man does not shun all pleasures, but those that are immoderate, and contrary to reason. The fact that children and dumb animals seek pleasures, does not prove that all pleasures are evil: because they have from God their natural appetite, which is moved to that which is naturally suitable to them. ”

“ The virtuous and the useful depend on accordance with reason, and consequently nothing is virtuous or useful, without being good. But the pleasant depends on agreement with the appetite, which tends sometimes to that which is discordant from reason. Consequently not every object of pleasure is good in the moral order which depends on the order of reason. ”

“ We must therefore say that some pleasures are good, and that some are evil. For pleasure is a repose of the appetitive power in some loved good, and resulting from some operation; wherefore we assign a twofold reason for this assertion. The first is in respect of the good in which a man reposes with pleasure. ”

“ Not every pleasure arises from a "becoming"; for some pleasures result from perfect operations, as stated above. Accordingly nothing prevents some pleasure being the greatest good, although every pleasure is not such. ”

“ That which is good simply, is good in itself. Now that which is not good in itself, may be good in respect of some individual in two ways. In one way, because it is suitable to him by reason of a disposition in which he is now, which disposition, however, is not natural: thus it is sometimes good for a leper to eat things that are poisonous, which are not suitable simply to the human temperament. ”

“ Accordingly, man's last end may be said to be either God Who is the Supreme Good simply; or the enjoyment of God, which implies a certain pleasure in the last end. And in this sense a certain pleasure of man may be said to be the greatest among human goods. ”

“ But in this case the pleasure is not morally evil; as neither is sleep, whereby the reason is fettered, morally evil, if it be taken according to reason: for reason itself demands that the use of reason be interrupted at times. We must add, however, that although this fettering of the reason through the pleasure of conjugal intercourse has no moral malice, since it is neither a mortal nor a venial sin ”

“ First, because, from observing that sensible and bodily pleasure consists in a certain movement and "becoming," as is evident in satiety from eating and the like; he concluded that all pleasure arises from some "becoming" and movement: and from this, since "becoming" and movement are the acts of something imperfect, it would follow that pleasure is not of the nature of ultimate perfection. ”

“ This argument is true of the greatest good simply, by participation of which all things are good; wherefore no addition can make it better: whereas in regard to other goods, it is universally true that any good becomes better by the addition of another good. ”

“ And they held that all bodily pleasures should be reckoned as bad, and thus that man, being prone to immoderate pleasures, arrives at the mean of virtue by abstaining from pleasure. But they were wrong in holding this opinion. Because, since none can live without some sensible and bodily pleasure, if they who teach that all pleasures are evil, are found in the act of taking pleasure ”