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   We must now consider the parts of justice; (1) the subjective parts, 
which are the species of justice, i.e. distributive and commutative 
justice; (2) the quasi-integral parts; (3) the quasi-potential parts, 
i.e. the virtues connected with justice. The first consideration will be 
twofold: (1) The parts of justice; (2) their opposite vices. And since 
restitution would seem to be an act of commutative justice, we must 
consider (1) the distinction between commutative and distributive 
justice; (2) restitution.
Under the first head there are four points of inquiry:
    (1) Whether there are two species of justice, viz. distributive and 
commutative?
(2) Whether in either case the mean is take in the same way?
(3) Whether their matter is uniform or manifold?
    (4) Whether in any of these species the just is the same as 
counter-passion?
	
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  Objection 1: It would seem that the two species of justice are unsuitably 
assigned, viz. distributive and commutative. That which is hurtful to the 
many cannot be a species of justice, since justice is directed to the 
common good. Now it is hurtful to the common good of the many, if the 
goods of the community are distributed among many, both because the goods 
of the community would be exhausted, and because the morals of men would 
be corrupted. For Tully says (De Offic. ii, 15): "He who receives becomes 
worse, and the more ready to expect that he will receive again." 
Therefore distribution does not belong to any species of justice.
  Objection 2: Further, the act of justice is to render to each one what is his 
own, as stated above (Question [58], Article [2]). But when things are distributed, a 
man does not receive what was his, but becomes possessed of something 
which belonged to the community. Therefore this does not pertain to 
justice.
  Objection 3: Further, justice is not only in the sovereign, but also in the 
subject, as stated above (Question [58], Article [6]). But it belongs exclusively to the 
sovereign to distribute. Therefore distribution does not always belong to 
justice.
Objection 4: Further, "Distributive justice regards common goods" (Ethic. v, 4). Now matters regarding the community pertain to legal justice. Therefore distributive justice is a part, not of particular, but of legal justice.
  Objection 5: Further, unity or multitude do not change the species of a 
virtue. Now commutative justice consists in rendering something to one 
person, while distributive justice consists in giving something to many. 
Therefore they are not different species of justice.
  On the contrary, The Philosopher assigns two parts to justice and says 
(Ethic. v, 2) that "one directs distributions, the other, commutations."
  I answer that, As stated above (Question [58], Articles [7],8), particular justice is 
directed to the private individual, who is compared to the community as a 
part to the whole. Now a twofold order may be considered in relation to a 
part. In the first place there is the order of one part to another, to 
which corresponds the order of one private individual to another. This 
order is directed by commutative justice, which is concerned about the 
mutual dealings between two persons. In the second place there is the 
order of the whole towards the parts, to which corresponds the order of 
that which belongs to the community in relation to each single person. 
This order is directed by distributive justice, which distributes common 
goods proportionately. Hence there are two species of justice, 
distributive and commutative.
  Reply to Objection 1: Just as a private individual is praised for moderation in 
his bounty, and blamed for excess therein, so too ought moderation to be 
observed in the distribution of common goods, wherein distributive 
justice directs.
  Reply to Objection 2: Even as part and whole are somewhat the same, so too that 
which pertains to the whole, pertains somewhat to the part also: so that 
when the goods of the community are distributed among a number of 
individuals each one receives that which, in a way, is his own.
  Reply to Objection 3: The act of distributing the goods of the community, belongs 
to none but those who exercise authority over those goods; and yet 
distributive justice is also in the subjects to whom those goods are 
distributed in so far as they are contented by a just distribution. 
Moreover distribution of common goods is sometimes made not to the state 
but to the members of a family, and such distribution can be made by 
authority of a private individual.
  Reply to Objection 4: Movement takes its species from the term "whereunto." Hence 
it belongs to legal justice to direct to the common good those matters 
which concern private individuals: whereas on the contrary it belongs to 
particular justice to direct the common good to particular individuals by 
way of distribution.
Reply to Objection 5: Distributive and commutative justice differ not only in respect of unity and multitude, but also in respect of different kinds of due: because common property is due to an individual in one way, and his personal property in another way.
	
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  Objection 1: It would seem that the mean in distributive justice is to be 
observed in the same way as in commutative justice. For each of these is 
a kind of particular justice, as stated above (Article [1]). Now the mean is 
taken in the same way in all the parts of temperance or fortitude. 
Therefore the mean should also be observed in the same way in both 
distributive and commutative justice.
  Objection 2: Further, the form of a moral virtue consists in observing the 
mean which is determined in accordance with reason. Since, then, one 
virtue has one form, it seems that the mean for both should be the same.
  Objection 3: Further, in order to observe the mean in distributive justice we 
have to consider the various deserts of persons. Now a person's deserts 
are considered also in commutative justice, for instance, in punishments; 
thus a man who strikes a prince is punished more than one who strikes a 
private individual. Therefore the mean is observed in the same way in 
both kinds of justice.
  On the contrary, The Philosopher says (Ethic. v, 3,4) that the mean in 
distributive justice is observed according to "geometrical proportion," 
whereas in commutative justice it follows "arithmetical proportion."
  I answer that, As stated above (Article [1]), in distributive justice something 
is given to a private individual, in so far as what belongs to the whole 
is due to the part, and in a quantity that is proportionate to the 
importance of the position of that part in respect of the whole. 
Consequently in distributive justice a person receives all the more of 
the common goods, according as he holds a more prominent position in the 
community. This prominence in an aristocratic community is gauged 
according to virtue, in an oligarchy according to wealth, in a democracy 
according to liberty, and in various ways according to various forms of 
community. Hence in distributive justice the mean is observed, not 
according to equality between thing and thing, but according to 
proportion between things and persons: in such a way that even as one 
person surpasses another, so that which is given to one person surpasses 
that which is allotted to another. Hence the Philosopher says (Ethic. v, 
3,4) that the mean in the latter case follows "geometrical proportion," 
wherein equality depends not on quantity but on proportion. For example 
we say that 6 is to 4 as 3 is to 2, because in either case the proportion 
equals 1-1/2; since the greater number is the sum of the lesser plus its 
half: whereas the equality of excess is not one of quantity, because 6 
exceeds 4 by 2, while 3 exceeds 2 by 1.
   On the other hand in commutations something is paid to an individual on 
account of something of his that has been received, as may be seen 
chiefly in selling and buying, where the notion of  commutation is found 
primarily. Hence it is necessary to equalize thing with thing, so that 
the one person should pay back to the other just so much as he has become 
richer out of that which belonged to the other. The result of this will 
be equality according to the "arithmetical mean" which is gauged 
according to equal excess in quantity. Thus 5 is the mean between 6 and 
4, since it exceeds the latter and is exceeded by the former, by 1. 
Accordingly if, at the start, both persons have 5, and one of them 
receives 1 out of the other's belongings, the one that is the receiver, 
will have 6, and the other will be left with 4: and so there will be 
justice if both be brought back to the mean, 1 being taken from him that 
has 6, and given to him that has 4, for then both will have 5 which is 
the mean.
  Reply to Objection 1: In the other moral virtues the rational, not the real mean, 
is to be followed: but justice follows the real mean; wherefore the mean, 
in justice, depends on the diversity of things.
  Reply to Objection 2: Equality is the general form of justice, wherein 
distributive and commutative justice agree: but in one we find equality 
of geometrical proportion, whereas in the other we find equality of 
arithmetical proportion.
  Reply to Objection 3: In actions and passions a person's station affects the 
quantity of a thing: for it is a greater injury to strike a prince than a 
private person. Hence in distributive justice a person's station is 
considered in itself, whereas in commutative justice it is considered in 
so far as it causes a diversity of things.
	
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  Objection 1: It would seem that there is not a different matter for both kinds 
of justice. Diversity of matter causes diversity of virtue, as in the 
case of fortitude and temperance. Therefore, if distributive and 
commutative justice have different matters, it would seem that they are 
not comprised under the same virtue, viz. justice.
  Objection 2: Further, the distribution that has to do with distributive 
justice is one of "wealth or of honors, or of whatever can be distributed 
among the members of the community" (Ethic. v, 2), which very things are 
the subject matter of commutations between one person and another, and 
this belongs to commutative justice. Therefore the matters of 
distributive and commutative justice are not distinct.
  Objection 3: Further, if the matter of distributive justice differs from that 
of commutative justice, for the reason that they differ specifically, 
where there is no specific difference, there ought to be no diversity of 
matter. Now the Philosopher (Ethic. v, 2) reckons commutative justice as 
one species, and yet this has many kinds of matter. Therefore the matter 
of these species of justice  is, seemingly, not of many kinds.
  On the contrary, It is stated in Ethic. v, 2 that "one kind of justice 
directs distributions, and another commutations."
  I answer that, As stated above (Question [51], Articles [8],10), justice is about 
certain external operations, namely distribution and commutation. These 
consist in the use of certain externals, whether things, persons or even 
works: of things, as when one man takes from or restores to another that 
which is his; of persons, as when a man does an injury to the very person 
of another, for instance by striking or insulting him, or even by showing 
respect for him; and of works, as when a man justly exacts a work of 
another, or does a work for him. Accordingly, if we take for the matter 
of each kind of justice the things themselves of which the operations are 
the use, the matter of distributive and commutative justice is the same, 
since things can be distributed out of the common property to 
individuals, and be the subject of commutation between one person and 
another; and again there is a certain distribution and payment of 
laborious works.
   If, however, we take for the matter of both kinds of justice the 
principal actions themselves, whereby we make use of persons, things, and 
works, there is then a difference of matter between them. For 
distributive justice directs distributions, while commutative justice 
directs commutations that can take place between two persons. of these 
some are involuntary, some voluntary. They are involuntary when anyone 
uses another man's chattel, person, or work against his will, and this 
may be done secretly by fraud, or openly by violence. In either case the 
offence may be committed against the other man's chattel or person, or 
against a person connected with him. If the offence is against his 
chattel and this be taken secretly, it is called "theft," if openly, it 
is called "robbery." If it be against another man's person, it may affect 
either the very substance of his person, or his dignity. If it be against 
the substance of his person, a man is injured secretly if he is 
treacherously slain, struck or poisoned, and openly, if he is publicly 
slain, imprisoned, struck or maimed. If it be against his personal 
dignity, a man is injured secretly by false witness, detractions and so 
forth, whereby he is deprived of his good name, and openly, by being 
accused in a court of law, or by public insult. If it be against a 
personal connection, a man is injured in the person of his wife, secretly 
(for the most part) by adultery, in the person of his slave, if the 
latter be induced to leave his master: which things can also be done 
openly. The same applies to other personal connections, and whatever 
injury may be committed against the principal, may be committed against 
them also. Adultery, however, and inducing a slave to leave his master 
are properly injuries against the person; yet the latter, since a slave 
is his master's chattel, is referred to theft. Voluntary commutations are 
when a man voluntarily transfers his chattel to another person. And if he 
transfer it simply so that the recipient incurs no debt, as in the case 
of gifts, it is an act, not of justice but of liberality. A voluntary 
transfer belongs to justice  in so far as it includes the notion of debt, 
and this may occur in many ways. First when one man simply transfers his 
thing to another in exchange for another thing, as happens in selling and 
buying. Secondly when a man transfers his thing to another, that the 
latter may have the use of it with the obligation of returning it to its 
owner. If he grant the use of a thing gratuitously, it is called 
"usufruct" in things that bear fruit; and simply "borrowing" on "loan" in 
things that bear no fruit, such as money, pottery, etc.; but if not even 
the use is granted gratis, it is called "letting" or "hiring." Thirdly, a 
man transfers his thing with the intention of recovering it, not for the 
purpose of its use, but that it may be kept safe, as in a "deposit," or 
under some obligation, as when a man pledges his property, or when one 
man stands security for another. In all these actions, whether voluntary 
or involuntary, the mean is taken in the same way according to the 
equality of repayment. Hence all these actions belong to the one same 
species of justice, namely commutative justice. And this suffices for the 
Replies to the Objections.
	
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  Objection 1: It would seem that the just is absolutely the same as 
retaliation. For the judgment of God is absolutely just. Now the judgment 
of God is such that a man has to suffer in proportion with his deeds, 
according to Mt. 7:2: "With what measure you judge, you shall be judged: 
and with what measure you mete, it shall be measured to you again." 
Therefore the just is absolutely the same as retaliation.
  Objection 2: Further, in either kind of justice something is given to someone 
according to a kind of equality. In distributive justice this equality 
regards personal dignity, which would seem to depend chiefly on what a 
person has done for the good of the community; while in commutative 
justice it regards the thing in which a person has suffered loss. Now in 
respect of either equality there is retaliation in respect of the deed 
committed. Therefore it would seem that the just is absolutely the same 
as retaliation.
  Objection 3: Further, the chief argument against retaliation is based on the 
difference between the voluntary and the involuntary; for he who does an 
injury involuntarily is less severely punished. Now voluntary and 
involuntary taken in relation to ourselves, do not diversify the mean of 
justice since this is the real mean and does not depend on us. Therefore 
it would seem that the just is absolutely the same as retaliation.
  On the contrary, The Philosopher proves (Ethic. v, 5) that the just is 
not always the same as retaliation.
  I answer that, Retaliation [contrapassum] denotes equal passion repaid 
for previous action; and the expression applies most properly to 
injurious passions and actions, whereby a man harms the person of his 
neighbor; for instance if a man strike, that he be  struck back. This 
kind of just is laid down in the Law (@Ex. 21:23,24): "He shall render 
life for life, eye for eye," etc. And since also to take away what 
belongs to another is to do an unjust thing, it follows that secondly 
retaliation consists in this also, that whosoever causes loss to another, 
should suffer loss in his belongings. This just loss is also found in the 
Law (@Ex. 22:1): "If any man steal an ox or a sheep, and kill or sell it, 
he shall restore five oxen for one ox and four sheep for one sheep." 
Thirdly retaliation is transferred to voluntary commutations, where 
action and passion are on both sides, although voluntariness detracts 
from the nature of passion, as stated above (Question [59], Article [3]).
   In all these cases, however, repayment must be made on a basis of 
equality according to the requirements of commutative justice, namely 
that the meed of passion be equal to the action. Now there would not 
always be equality if passion were in the same species as the action. 
Because, in the first place, when a person injures the person of one who 
is greater, the action surpasses any passion of the same species that he 
might undergo, wherefore he that strikes a prince, is not only struck 
back, but is much more severely punished. In like manner when a man 
despoils another of his property against the latter's will, the action 
surpasses the passion if he be merely deprived of that thing, because the 
man who caused another's loss, himself would lose nothing, and so he is 
punished by making restitution several times over, because not only did 
he injure a private individual, but also the common weal, the security of 
whose protection he has infringed. Nor again would there be equality of 
passion in voluntary commutations, were one always to exchange one's 
chattel for another man's, because it might happen that the other man's 
chattel is much greater than our own: so that it becomes necessary to 
equalize passion and action in commutations according to a certain 
proportionate commensuration, for which purpose money was invented. Hence 
retaliation is in accordance with commutative justice: but there is no 
place for it in distributive justice, because in distributive justice we 
do not consider the equality between thing and thing or between passion 
and action (whence the expression 'contrapassum'), but according to 
proportion between things and persons, as stated above (Article [2]).
  Reply to Objection 1: This form of the Divine judgment is in accordance with the 
conditions of commutative justice, in so far as rewards are apportioned 
to merits, and punishments to sins.
  Reply to Objection 2: When a man who has served the community is paid for his 
services, this is to be referred to commutative, not distributive, 
justice. Because distributive justice considers the equality, not between 
the thing received and the thing done, but between the thing received by 
one person and the thing received by another according to the respective 
conditions of those persons.
Reply to Objection 3: When the injurious action is voluntary, the injury is aggravated and consequently is considered as a greater thing. Hence it requires a greater punishment in repayment, by reason of a difference, not on part, but on the part of the thing.