On the contrary, It is written (Ps. 118:165): "Much peace have they that love Thy Law."
I answer that, Peace implies a twofold union, as stated above (A. 1). The first is the result of one's own appetites being directed to one object; while the other results from one's own appetite being united with the appetite of another: and each of these unions is effected by charity—the first, in so far as man loves God with his whole heart, by referring all things to Him, so that all his desires tend to one object—the second, in so far as we love our neighbor as ourselves, the result being that we wish to fulfil our neighbor's will as though it were ours: hence it is reckoned a sign of friendship if people "make choice of the same things" (Ethic. ix, 4), and Tully says (De Amicitia) that friends "like and dislike the same things" (Sallust, Catilin.)
Reply Obj. 1: Without sin no one falls from a state of sanctifying grace, for it turns man away from his due end by making him place his end in something undue: so that his appetite does not cleave chiefly to the true final good, but to some apparent good. Hence, without sanctifying grace, peace is not real but merely apparentapparent.
Reply Obj. 2: As the Philosopher says (Ethic. ix, 6) friends need not agree in opinion, but only upon such goods as conduce to life, and especially upon such as are important; because dissension in small matters is scarcely accounted dissension. Hence nothing hinders those who have charity from holding different opinions. Nor is this an obstacle to peace, because opinions concern the intellect, which precedes the appetite that is united by peace. In like manner if there be concord as to goods of importance, dissension with regard to some that are of little account is not contrary to charity: for such a dissension proceeds from a difference of opinion, because one man thinks that the particular good, which is the object of dissension, belongs to the good about which they agree, while the other thinks that it does not. Accordingly such like dissension about very slight matters and about opinions is inconsistent with a state of perfect peace, wherein the truth will be known fully, and every desire fulfilled; but it is not inconsistent with the imperfect peace of the wayfarer.
Reply Obj. 3: Peace is the "work of justice" indirectly, in so far as justice removes the obstacles to peace: but it is the work of charity directly, since charity, according to its very nature, causes peace. For love is "a unitive force" as Dionysius says (Div. Nom. iv): and peace is the union of the appetite's inclinations. _______________________
FOURTH ARTICLE [II-II, Q. 29, Art. 4]
Whether Peace Is a Virtue?
Objection 1: It would seem that peace is a virtue. For nothing is a matter of precept, unless it be an act of virtue. But there are precepts about keeping peace, for example: "Have peace among you" (Mk. 9:49). Therefore peace is a virtue.
Obj. 2: Further, we do not merit except by acts of virtue. Now it is meritorious to keep peace, according to Matt. 5:9: "Blessed are the peacemakers, for they shall be called the children of God." Therefore peace is a virtue.
Obj. 3: Further, vices are opposed to virtues. But dissensions, which are contrary to peace, are numbered among the vices (Gal. 5:20). Therefore peace is a virtue.