Genesis 34:7

7. And the sons of Jacob came out of the field. Moses begins to relate the tragic issue of this history. Shechem, indeed, had acted wickedly and impiously; but it was far more atrocious and wicked that the sons of Jacob should murder a whole people, to avenge themselves of the private fault of one man. It was by no means fitting to seek a cruel compensation for the levity and rashness of one youth, by the slaughter of so many men. Again, who had constituted them judges, that they should dare, with their own hands, to execute vengeance for an injury inflicted upon them? Perfidy was also superadded, because they proceeded, under the pretext of a covenant, to perpetrate this enormous crime. In Jacob, moreover, we have an admirable example of patient endurance; who, though afflicted with so many evils, yet did not faint under them. But chiefly we must consider the mercy of God, by which it came to pass, that the covenant of grace remained with the posterity of Jacob. For what seemed less suitable, than that a few men in whom such furious rage and such implacable malice reigned, should be reckoned among the people and the sons of God, to the exclusion of all the world besides? We see certainly that it was not through any power of their own that they had not altogether declined from the kingdom of God. Whence it appears that the favor which God had vouchsafed unto them was gratuitous, and not founded upon their merits. We also require to be treated by Him with the same indulgence, seeing that we should utterly fall away, if God did not pardon our sins. The sons of Jacob have, indeed, a just cause of offense, because not only are they affected with their own private ignominy, but they are tormented with the indignity of the crime, because their sister had been dragged forth from the house of Jacob, as from a sanctuary, to be violated. For this they chiefly urge, that it would have been wickedness to allow such disgrace in the elect and holy people: but they themselves, through the hatred of one sin, rush furiously forward to greater and more intolerable crimes. Therefore we must beware, lest, after we have become severe judges in condemning the faults of others, we hasten inconsiderately into evil. But chiefly we must abstain from violent remedies which surpass the evil we desire to correct.

Which thing ought not to be done Interpreters commonly explain the passage as meaning, “it is not becoming that such a thing should be done;” but, in my judgment, it applies more properly to the sons of Jacob, who had determined with themselves that the injury was not to be borne. Yet they wrongfully appropriate to themselves the right of taking revenge: why do they not rather reflect thus; “God, who has received us under his care and protection, will not suffer this injury to pass unavenged; in the meantime, it is our part to be silent, and to leave the act of punishing, which is not placed in our hands, entirely to his sovereign will.” Hence we may learn, when we are angry at the sins of other men, not to attempt anything which is beyond our own duty.