Reply Obj. 1: Another's action may be conjoined to me, either by its effect, as in the first way, or by knowledge, as in the second way; or by affection, as in the third way.
Reply Obj. 2: This argument avails for the third mode, but not for the first two.
Reply Obj. 3: Although the actions of another do not proceed from habits that are in me, yet they either produce in me something that gives pleasure; or they make me appreciate or know a habit of mind; or they proceed from the habit of one who is united to me by love. ________________________
SIXTH ARTICLE [I-II, Q. 32, Art. 6]
Whether Doing Good to Another Is a Cause of Pleasure?
Objection 1: It would seem that doing good to another is not a cause of pleasure. Because pleasure is caused by one's obtaining one's proper good, as stated above (AA. 1, 5; Q. 31, A. 1). But doing good pertains not to the obtaining but to the spending of one's proper good. Therefore it seems to be the cause of sadness rather than of pleasure.
Obj. 2: Further, the Philosopher says (Ethic. iv, 1) that "illiberality is more connatural to man than prodigality." Now it is a mark of prodigality to do good to others; while it is a mark of illiberality to desist from doing good. Since therefore everyone takes pleasure in a connatural operation, as stated in Ethic. vii, 14 and x, 4, it seems that doing good to others is not a cause of pleasure.
Obj. 3: Further, contrary effects proceed from contrary causes. But man takes a natural pleasure in certain kinds of ill-doing, such as overcoming, contradicting or scolding others, or, if he be angry, in punishing them, as the Philosopher says (Rhet. i, 11). Therefore doing good to others is a cause of sadness rather than pleasure.
On the contrary, The Philosopher says (Polit. ii, 2) that "it is most pleasant to give presents or assistance to friends and strangers."
I answer that, Doing good to another may give pleasure in three ways. First, in consideration of the effect, which is the good conferred on another. In this respect, inasmuch as through being united to others by love, we look upon their good as being our own, we take pleasure in the good we do to others, especially to our friends, as in our own good. Secondly, in consideration of the end; as when a man, from doing good to another, hopes to get some good for himself, either from God or from man: for hope is a cause of pleasure. Thirdly, in consideration of the principle: and thus, doing good to another, can give pleasure in respect of a threefold principle. One is the faculty of doing good: and in this regard, doing good to another becomes pleasant, in so far as it arouses in man an imagination of abundant good existing in him, whereof he is able to give others a share. Wherefore men take pleasure in their children, and in their own works, as being things on which they bestow a share of their own good. Another principle is man's habitual inclination to do good, by reason of which doing good becomes connatural to him: for which reason the liberal man takes pleasure in giving to others. The third principle is the motive: for instance when a man is moved by one whom he loves, to do good to someone: for whatever we do or suffer for a friend is pleasant, because love is the principal cause of pleasure.