Joshua 11:19

To this objection, I answer, that the Israelites, though they were forbidden to show them any mercy, were met in a hostile manner, in order that the war might be just. And it was wonderfully arranged by the secret providence of God, that, being doomed to destruction, they should voluntarily offer themselves to it, and by provoking the Israelites be the cause of their own ruin. The Lord, therefore, besides ordering that pardon should be denied them, also incited them to blind fury, that no room might be left for mercy. And it behooved the people not to be too wise or prying in this matter. For while the Lord, on the one hand, interdicted them from entering into any covenant, and, on the other, was unwilling that they should take hostile measures without being provoked, a too anxious discussion of the procedure might have greatly unsettled their minds. Hence the only way of freeing themselves from perplexity was to lay their care on the bosom of God. And he in his incomprehensible wisdom provided that when the time for action arrived, his people should not be impeded in their course by any obstacle. Thus the kings beyond the Jordan, as they had been the first to take up arms, justly suffered the punishment of their temerity. For the Israelites did not assail them with hostile arms until they had been provoked. In the same way, also, the citizens of Jericho, by having shut their gates, were the first to declare war. The case is the same with the others, who, by their obstinacy, furnished the Israelites with a ground for prosecuting the war.

It now appears how perfectly consistent the two things are. The Lord commanded Moses to destroy the nations whom he had doomed to destruction; and he accordingly opened a way for his own decree when he hardened the reprobate. In the first place, then, stands the will of God, which must be regarded as the principal cause. For seeing their iniquity had reached its height, he determined to destroy them. This was the origin of the command given to Moses, a command, however, which would have failed of its effect had not the chosen people been armed to execute the divine judgment, by the perverseness and obstinacy of those who were to be destroyed. God hardens them for this very end, that they may shut themselves out from mercy. Hence that hardness is called his work, because it secures the accomplishment of his design. Should any attempt be made to darken so clear a matter by those who imagine that God only looks down from heaven to see what men will be pleased to do, and who cannot bear to think that the hearts of men are curbed by his secret agency, what else do they display than their own presumption? They only allow God a permissive power, and in this way make his counsel dependent on the pleasure of men. But what says the Spirit? That the hardening is from God, who thus precipitates those whom he means to destroy.