That the word is so used is easily shown. In the case of the other kinds of badness, the man who displays them, though he acts unjustly [in one sense of the word], yet does not take more than his share: for instance, when a man throws away his shield through cowardice, or reviles another through ill temper, or through illiberality refuses to help another with money. But when he takes more than his share, he displays perhaps no one of these vices, nor does he display them all, yet he displays a kind of badness (for we blame him), namely, injustice [in the second sense of the word].
We see, then, that there is another sense of the word injustice, in which it stands for a part of that injustice which is coextensive with badness, and another sense of the word unjust, in which it is applied to a part only of those things to which it is applied in the former sense of “contrary to law.”