The second reason can be found by considering the actions, some of which are good, some evil. Now pleasures which are conjoined to actions are more akin to those actions, than desires, which precede them in point of time. Wherefore, since the desires of good actions are good, and of evil actions, evil; much more are the pleasures of good actions good, and those of evil actions evil.
Reply Obj. 1: As stated above (Q. 33, A. 3), it is not the pleasures which result from an act of reason, that hinder the reason or destroy prudence, but extraneous pleasures, such as the pleasures of the body. These indeed hinder the use of reason, as stated above (Q. 33, A. 3), either by contrariety of the appetite that rests in something repugnant to reason, which makes the pleasure morally bad; or by fettering the reason: thus in conjugal intercourse, though the pleasure be in accord with reason, yet it hinders the use of reason, on account of the accompanying bodily change. 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; yet it proceeds from a kind of moral malice, namely, from the sin of our first parent; because, as stated in the First Part (Q. 98, A. 2) the case was different in the state of innocence.
Reply Obj. 2: 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.
Reply Obj. 3: Art is not concerned with all kinds of good, but with the making of external things, as we shall state further on (Q. 57, A. 3). But actions and passions, which are within us, are more the concern of prudence and virtue than of art. Nevertheless there is an art of making pleasure, namely, "the art of cookery and the art of making arguments," as stated in Ethic. vii, 12. ________________________
SECOND ARTICLE [I-II, Q. 34, Art. 2]
Whether Every Pleasure Is Good?
Objection 1: It would seem that every pleasure is good. Because as stated in the First Part (Q. 5, A. 6) there are three kinds of good: the virtuous, the useful, and the pleasant. But everything virtuous is good; and in like manner everything useful is good. Therefore also every pleasure is good.
Obj. 2: Further, that which is not sought for the sake of something else, is good in itself, as stated in Ethic. i, 6, 7. But pleasure is not sought for the sake of something else; for it seems absurd to ask anyone why he seeks to be pleased. Therefore pleasure is good in itself. Now that which is predicated of a thing considered in itself, is predicated thereof universally. Therefore every pleasure is good.
Obj. 3: Further, that which is desired by all, seems to be good of itself: because good is "what all things seek," as stated in Ethic. i, 1. But everyone seeks some kind of pleasure, even children and dumb animals. Therefore pleasure is good in itself: and consequently all pleasure is good.
On the contrary, It is written (Prov. 2:14): "Who are glad when they have done evil, and rejoice in most wicked things."