M. Tullius Cicero Divinatio in Q. Caecilium 54

[54] But if a man has only one of them, then the question usually asked is, not what he is inclined to do, but what he is able to do. And if you think that the office of prosecutor ought to be entrusted to him above all other men, to whom Caius Verres has done the greatest injury, which do you think the judges ought to be most indignant at,—at your having been injured by him, or at the whole province of Sicily having been harassed and ruined by him? I think you must grant that this both is the worst thing of the two, and that it ought to be considered the worst by every one. A flow, therefore, that the province ought to be preferred to you as the prosecutor. For the province is prosecuting when he is pleading the cause whom the province has adopted as the defender of her rights, the avenger of her injuries, and the pleader of the whole cause.