Justice

[ajaxfetish]

I think in simple terms (not getting philosophical or legalistic here, and thus easily open to error) justice means goodness is rewarded with goodness and evil with evil. It could be enforced by men (through law), by nature, (eg karma) or by a divine power (eternal justice of God). Generally speaking I think it is a good thing, as it encourages goodness and discourages evil. Men are unjust when they think they can escape justice and receive good rewards for evil actions.

Ajax

edit: what is considered 'good' or 'evil' is of course subjective, and at the discretion of the judging power (lawmakers, God, natural law, whatever)