On the contrary, The precepts of the law are about acts of virtue. Now it is written (Ecclus. 4:7): "Make thyself affable to the congregation of the poor." Therefore affability, which is what we mean by friendship, is a special virtue.
I answer that, As stated above (Q. 109, A. 2; I-II, Q. 55, A. 3), since virtue is directed to good, wherever there is a special kind of good, there must needs be a special kind of virtue. Now good consists in order, as stated above (Q. 109, A. 2). And it behooves man to be maintained in a becoming order towards other men as regards their mutual relations with one another, in point of both deeds and words, so that they behave towards one another in a becoming manner. Hence the need of a special virtue that maintains the becomingness of this order: and this virtue is called friendliness.
Reply Obj. 1: The Philosopher speaks of a twofold friendship in his Ethics. One consists chiefly in the affection whereby one man loves another and may result from any virtue. We have stated above, in treating of charity (Q. 23, A. 1, A. 3, ad 1; QQ. 25, 26), what things belong to this kind of friendship. But he mentions another friendliness, which consists merely in outward words or deeds; this has not the perfect nature of friendship, but bears a certain likeness thereto, in so far as a man behaves in a becoming manner towards those with whom he is in contact.
Reply Obj. 2: Every man is naturally every man's friend by a certain general love; even so it is written (Ecclus. 13:19) that "every beast loveth its like." This love is signified by signs of friendship, which we show outwardly by words or deeds, even to those who are strangers or unknown to us. Hence there is no dissimulation in this: because we do not show them signs of perfect friendship, for we do not treat strangers with the same intimacy as those who are united to us by special friendship.
Reply Obj. 3: When it is said that "the heart of the wise is where there is mourning" it is not that he may bring sorrow to his neighbor, for the Apostle says (Rom. 14:15): "If, because of thy meat, thy brother be grieved, thou walkest not now according to charity": but that he may bring consolation to the sorrowful, according to Ecclus. 7:38, "Be not wanting in comforting them that weep, and walk with them that mourn." Again, "the heart of fools is where there is mirth," not that they may gladden others, but that they may enjoy others' gladness. Accordingly, it belongs to the wise man to share his pleasures with those among whom he dwells, not lustful pleasures, which virtue shuns, but honest pleasures, according to Ps. 132:1, "Behold how good and how pleasant it is for brethren to dwell together in unity."
Nevertheless, as the Philosopher says (Ethic. iv, 6), for the sake of some good that will result, or in order to avoid some evil, the virtuous man will sometimes not shrink from bringing sorrow to those among whom he lives. Hence the Apostle says (2 Cor. 7:8): "Although I made you sorrowful by my epistle, I do not repent," and further on (2 Cor. 7:9), "I am glad; not because you were made sorrowful, but because you were made sorrowful unto repentance." For this reason we should not show a cheerful face to those who are given to sin, in order that we may please them, lest we seem to consent to their sin, and in a way encourage them to sin further. Hence it is written (Ecclus. 7:26): "Hast thou daughters? Have a care of their body, and show not thy countenance gay towards them." _______________________
SECOND ARTICLE [II-II, Q. 114, Art. 2]
Whether This Kind of Friendship Is a Part of Justice?
Objection 1: It seems that this kind of friendship is not a part of justice. For justice consists in giving another man his due. But this virtue does not consist in doing that, but in behaving agreeably towards those among whom we live. Therefore this virtue is not a part of justice.
Obj. 2: Further, according to the Philosopher (Ethic. iv, 6), this virtue is concerned about the joys and sorrows of those who dwell in fellowship. Now it belongs to temperance to moderate the greatest pleasures, as stated above (I-II, Q. 60, A. 5; Q. 61, A. 3). Therefore this virtue is a part of temperance rather than of justice.