Fairness.
A state of affairs in which conduct or action is both fair and right, given the circumstances.
In law, it more specifically refers to the paramount obligation to ensure that all persons are treated fairly.
Litigants "seek justice" by asking for compensation for wrongs committed against them; to right the inequity such that, with the compensation, a wrong has been righted and the balance of "good" or "virtue" over "wrong" or "evil" has been corrected.
"Set aside justice," wrote St. Augustine in City of God, Book IV, Chapter 4, "and what are kingdoms but entreprises of robbery".