About Justice

Aristotle in his book Nicomaquean Ethics define  Justice as give and receive proportionately, Aristotle also defines Justice as generalized friendship. The end of Justice is fundamentally the happiness but also the end of justice is the friendship thence this double definition.
Aristotle defines virtue as the middle term between the excess and the defect, nevertheless justice is an exception to the definition because justice is not a middle term.
Not all Justice is good, sometimes Justice can be a mask, Aristotle explain that sometimes a vice can be shown as virtue, for example the rigor. This is because moral virtues like prudence, justice, temperance and fortitude describes an intermediate state between good and evil.
The equivalent in psychology of the cardinal virtues is the concept of mask. The fundament of Justice is love, that is why we can seem just without being as Plato in his book The Republic said....