F.H. Peters

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.

Is it really possible, I mean, to suffer injustice [or be wronged] voluntarily? or is suffering injustice always involuntary, as doing injustice is always voluntary?

For no one wishes to be hurt—even the incontinent man does not wish it, but acts contrary to his wish. No one wishes for anything that he does not think good; what the incontinent man does is not that which he thinks he ought to do.)