"The foundation of justice, moreover, is good_faith; — that is, truth and fidelity to promises and agreements. And therefore we may follow the Stoics, who diligently investigate the etymology of words; and we may accept their statement that "good faith" is so called because what is promised is "made good," although some may find this derivation/a rather farfetched. There are, on the other hand, two kinds of injustice — the 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.
Then, too, those very wrongs which people try to inflict on purpose to injure are often the result of fear: that is, he who premeditates injuring another is afraid that, if he does not do so, he may himself be made to suffer some hurt. But, for the most part, people are led to wrong-doing in order to secure some personal end; in this vice, avarice is generally the controlling motive."
Marcus Tullius Cicero
Translated by Walter Miller.
Cambridge: Harvard University Press,