Reply Obj. 1: The justice which faith works in us, is that whereby the ungodly is justified: it consists in the due coordination of the parts of the soul, as stated above (I-II, Q. 113, A. 1) where we were treating of the justification of the ungodly. Now this belongs to metaphorical justice, which may be found even in a man who lives all by himself.
This suffices for the Reply to the Second Objection.
Reply Obj. 3: God's justice is from eternity in respect of the eternal will and purpose (and it is chiefly in this that justice consists); although it is not eternal as regards its effect, since nothing is co-eternal with God.
Reply Obj. 4: Man's dealings with himself are sufficiently rectified by the rectification of the passions by the other moral virtues. But his dealings with others need a special rectification, not only in relation to the agent, but also in relation to the person to whom they are directed. Hence about such dealings there is a special virtue, and this is justice. _______________________
THIRD ARTICLE [II-II, Q. 58, Art. 3]
Whether Justice Is a Virtue?
Objection 1: It would seem that justice is not a virtue. For it is written (Luke 17:10): "When you shall have done all these things that are commanded you, say: We are unprofitable servants; we have done that which we ought to do." Now it is not unprofitable to do a virtuous deed: for Ambrose says (De Officiis ii, 6): "We look to a profit that is estimated not by pecuniary gain but by the acquisition of godliness." Therefore to do what one ought to do, is not a virtuous deed. And yet it is an act of justice. Therefore justice is not a virtue.
Obj. 2: Further, that which is done of necessity, is not meritorious. But to render to a man what belongs to him, as justice requires, is of necessity. Therefore it is not meritorious. Yet it is by virtuous actions that we gain merit. Therefore justice is not a virtue.
Obj. 3: Further, every moral virtue is about matters of action. Now those things which are wrought externally are not things concerning behavior but concerning handicraft, according to the Philosopher (Metaph. ix) [*Didot ed., viii, 8]. Therefore since it belongs to justice to produce externally a deed that is just in itself, it seems that justice is not a moral virtue.
On the contrary, Gregory says (Moral. ii, 49) that "the entire structure of good works is built on four virtues," viz. temperance, prudence, fortitude and justice.