Thomas Aquinas

“ 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. ”

“ 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. ”

“ 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. ”

“ 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 ”

“ 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. ”

“ 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. ”

“ 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. ”

“ 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. ”

“ 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. ”

“ 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. ”

“ 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. ”

“ 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. ”

“ 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 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. ”

“ 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 ”