The virtue of justice is best described as the actioned desire that what is due should be given in order to favour the ideal interaction between individuals in a community.
In other words you are just if you respect of everyone’s rights, strive to establish harmonious human relations and treat your neighbour for the common good without distinction of rank or position. Synonyms for justice might be found in equity, fairness, honesty and in obedience to the laws of men and of God. Severity should also be included as being inflexible in the infliction of punishment when right reason requires it.
Justice is a foundational virtue and is seen by some as the mother of all virtues, especially given its power to produce healthy communities.
Does this describe you? If so, well done, you are a just person.
The vices that oppose justice are illegality, which breaks rightful laws; unfairness, which denies to each what is due; dishonesty, which breaks covenants of truthfulness; partiality, which accords undue favours; and corruption, which bends what is right for personal gain.
There are also some excesses in the virtue of justice found in oppressive tyranny and some deficiencies that are found in submissiveness, which passively consents to oppression.
Do any of these describe you? If they do, and if your score in the Virtue Test was low in this virtue, then you may want to choose to work on the virtue of justice in your character.