We have already distinguished two senses in which we speak of things as unjust, viz. (1) contrary to law, (2) unfair; and two senses in which we speak of things as just, viz. (1) according to law, (2) fair.

The injustice which we have already considered corresponds to unlawful.

But since unfair is not the same as unlawful, but differs from it as the part from the whole (for unfair is always unlawful, but unlawful is not always unfair), unjust and injustice in the sense corresponding to unfair will not be the same as unjust and injustice in the sense corresponding to unlawful, but different as the part from the whole; for this injustice is a part of complete injustice, and the corresponding justice is a part of complete justice. We must therefore speak of justice and injustice, and of that which is just and that which is unjust, in this limited sense.