Review the nature of the moral justice from the perspective of Avicenna

Cognition of the nature of things is so important that sometimes there isn’t any necessity to argumentation for proving various properties for them. “Justice” is one of the most fundamental human obsessions in the field of ethics and social issues that it is spoken so much about its properties, but interpretation of its nature is sometimes neglected. The main question in this article is about the nature of justice. This research has done with a focus on the Avicenna's ideas and it has been concluded that because he refused to believe an independent nature for justice so Avicenna didn’t propose any essential definition for it. And then with rejection of the Avicenna’s theory that the Justice is collection of three virtues of continence, courage and wisdom, it is explained that the justice is original and triple virtues are branches of it. Justice has a unitary reality that in any faculty - due to that faculty – a certain virtue is abstracted from it. Thus, justice is the basis of all the virtues and other virtues are manifestations of it. Finally, the theory of the "fluid nature of justice" as well as theory of "separation Justice from moderation" has been answered and the relation between the philosophical and legal justice has been proposed.