There are, on the other hand, two kinds of injustice—the 3 one, on the part of those who inflict wrong, the other on the part of those who, when they can, do not shield from wrong those upon whom it is being inflicted. For he who, under the influence of anger or some other passion, wrongfully assaults another seems, as it were, to be laying violent hands upon a comrade; but he who does not prevent or oppose wrong, if he can, is just as guilty of wrong as if he deserted his parents or his friends or his country.