 Second, Justinian’s definition underlines that just treatment is something due to each person, in other words that justice is a matter of claims that can be rightfully made against the agent dispensing justice, whether a person or an institution. Here there is a contrast with other virtues: we demand justice, but we beg for charity or forgiveness. This also means that justice is a matter of obligation for the agent dispensing it, and that the agent wrongs the recipient if the latter is denied what is due to her. It is a characteristic mark of justice that the obligations it creates should be enforceable: we can be made to deliver what is due to others as a matter of justice, either by the recipients themselves or by third parties. However it overstates the position to make the enforceability of its requirements a defining feature of justice (see Buchanan 1987). On the one hand, there are some claims of justice that seem not to be enforceable (by anyone). When we dispense gifts to our children or our friends, we ought to treat each recipient fairly, but neither the beneficiaries themselves nor anyone else can rightfully force the giver to do so. On the other hand, in cases of extreme emergency, it may sometimes be justifiable to force people to do more than justice requires them to do – there may exist enforceable duties of humanity. But these are rare exceptions. The obligatory nature of justice generally goes hand-in-hand with enforceability.