On the contrary, Virtue is not the last end, but the way thereto. But peace is the last end, in a sense, as Augustine says (De Civ. Dei xix, 11). Therefore peace is not a virtue.
I answer that, As stated above (Q. 28, A. 4), when a number of acts all proceeding uniformly from an agent, follow one from the other, they all arise from the same virtue, nor do they each have a virtue from which they proceed, as may be seen in corporeal things. For, though fire by heating, both liquefies and rarefies, there are not two powers in fire, one of liquefaction, the other of rarefaction: and fire produces all such actions by its own power of calefaction.
Since then charity causes peace precisely because it is love of God and of our neighbor, as shown above (A. 3), there is no other virtue except charity whose proper act is peace, as we have also said in reference to joy (Q. 28, A. 4).
Reply Obj. 1: We are commanded to keep peace because it is an act of charity; and for this reason too it is a meritorious act. Hence it is placed among the beatitudes, which are acts of perfect virtue, as stated above (I-II, Q. 69, AA. 1, 3). It is also numbered among the fruits, in so far as it is a final good, having spiritual sweetness.
This suffices for the Reply to the Second Objection.
Reply Obj. 3: Several vices are opposed to one virtue in respect of its various acts: so that not only is hatred opposed to charity, in respect of its act which is love, but also sloth and envy, in respect of joy, and dissension in respect of peace. _______________________
QUESTION 30
OF MERCY* [*The one Latin word "misericordia" signifies either pity or mercy. The distinction between these two is that pity may stand either for the act or for the virtue, whereas mercy stands only for the virtue.] (In Four Articles)
We must now go on to consider Mercy, under which head there are four points of inquiry:
(1) Whether evil is the cause of mercy on the part of the person pitied?