As I understand things philosophically, I would percept justice as a state of mind in which varies depending on the individual. I would say that having sent a mass murderer suffering from lunacy to
death row would be definite justice, while others would have compassion on his mental illness and refer to justice as letting the man live on. So, even then, considering justice to be a state of mind is too a little inaccurate because all that justice is is a wide range of opinions of how to punish/respond to (another's) actions.