-:: Understandings of justice :: -
It has already been noted that justice is distinguished from other ethical standards as required and as overwhelmingly important: Justice can be thought of as distinct from, and more important than, benevolence, charity, mercy, generosity or compassion. All of these things may be valuable, but they are supererogatory rather than required. We need to know more than this: we need to know what justice is, not merely what it is not, and several answers to that problem have been proposed.

Justice is linked, both etymologically and conceptually, to the idea of justification: having and giving decisive reasons for one’s beliefs and actions. So, attempts to understand justice are typically attempts to discover the justification – the source or basis – of justice, and therefore to account for (or disprove) its overwhelming importance.

-:: Justice as natural law :: -

For advocates of the theory that justice is part of natural law, it involves the system of consequences which naturally derives from any action or choice. In this, it is similar to the laws of physics: in the same way as the Third of Newton's laws of Motion requires that for every action there must be an equal and opposite reaction, justice requires according individuals or groups what they actually deserve, merit, or are entitled to. Justice, on this account, is a universal and absolute concept: laws, principles, religions, etc., are merely attempts to codify that concept, sometimes with results that entirely contradict the true nature of justice.

-:: Institutions :: -

In an imperfect world, institutions are required to instantiate ideals of justice, however imperfectly. These institutions may be justified by their approximate instantiation of justice, or they may be deeply unjust when compared with ideal standards — consider the institution of slavery. Justice is an ideal which the world fails to live up to, sometimes despite good intentions, sometimes disastrously. The question of institutive justice raises issues of legitimacy, procedure, codification and interpretation, which are considered by legal theorists and by philosophers of law.

-:: Justice as human creation :: -
In contrast to the understandings canvassed so far, justice may be understood as a human creation, rather than a discovery of harmony, divine command, or natural law. This claim can be understood in a number of ways, with the fundamental division being between those who argue that justice is the creation of some humans, and those who argue that it is the creation of all humans.
 
-::Demands of justice in distribution and retribution ::-

Justice can be divided into two broad types. Distributive justice is concerned with the proper distribution of good things - wealth, power, reward, respect - between different people. So, for instance, egalitarianism is a theory of distributive justice which says that the proper distribution of wealth is an equal distribution: no-one in the relevant group should have more or less than anyone else in that group. Retributive justice is concerned with the proper response to wrongdoing. So, for instance, the lex talionis is a theory of retributive justice which says that the proper punishment is equal to the wrong suffered: "life for life, eye for eye, tooth for tooth, hand for hand, foot for foot, burning for burning, wound for wound, stripe for stripe."
 
 
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