A fascinating topic!

The idea of justice as a virtue is an ancient and ongoing philosophical debate. In this context, "virtue" refers to a moral excellence or character trait that is cultivated through habituation and practice.

**Plato's View**

In Plato's philosophy, justice (δικαιοσύνη, dikaiosyne) is indeed considered a virtue. He argues that justice is not just a set of rules or laws, but rather an inherent feature of the human soul. In his most famous work, "The Republic," Plato claims that justice is one of the four cardinal virtues, along with wisdom (σοφία), courage (ἀνδρεία), and temperance (σωφροσύνη).

According to Plato, justice is a harmony or balance within the individual's soul. It involves the proper ordering of reason, spirit, and appetite, ensuring that each part plays its natural role without dominating the others. This internal harmony allows individuals to live in accordance with the divine law, which is the ultimate standard of justice.

**Aristotle's View**

Aristotle, while influenced by Plato, offers a different perspective on justice as a virtue. In his "Nicomachean Ethics," Aristotle argues that justice is not just an individual virtue but also a social virtue. He claims that justice is achieved when individuals and societies operate according to the principles of fairness (ισόκρινσις, isokrinsis) and proportionality (ἀναλόγως, analogos).

Aristotle defines justice as "the mean between excess and deficiency" in the distribution of goods and services within a community. He also emphasizes that justice requires not only individual moral character but also the proper functioning of institutions and laws.

**Implications**

The idea of justice as a virtue has significant implications for how we understand morality, ethics, and politics. If justice is a virtue, then it is an excellence that can be cultivated through practice, education, and habituation. This perspective emphasizes the importance of character development in achieving just outcomes.

Furthermore, recognizing justice as a virtue highlights the need for individuals to take responsibility for their actions and for societies to establish institutions and laws that promote fairness and proportionality.

**Key Quotes**

* "Justice is the highest virtue." (Plato, The Republic)
* "Justice is not only a natural right of each individual but also a mean or middle term between excess and deficiency." (Aristotle, Nicomachean Ethics)

I hope this brief overview sparks interesting discussions about justice as a virtue!