Therefore the LORD left those nations, without driving them out hastily; neither delivered he them into the hand of Joshua.
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Augustine of Hippo
AD 430
Scripture tells you that the nations could have been cut off all at once from the land given to the children of Israel; yet God willed that it should only be little by little. We can think of any number of other things which we admit might have happened or may happen, though we can allege no instance of their occurrence. We should not then deny the possibility of human sinlessness, simply because there is no [sinless] person, save him who is not only man but very God, in whom we can show this perfection actually achieved. - "On the Spirit and the Letter 1"
Although all the nations in the surrounding country were subject to king David, still God did not allow the Jebusites to be destroyed entirely, as he himself says elsewhere: “I for my part will not clear away for them any more of the nations. Through them the Israelites were to be made to prove whether they would fear me.” For this reason the prophet said to David, “Go up, and build an altar to the Lord in the threshing floor of Araunah the Jebusite.” That pagan king represented the people of the Gentiles. Notice, brothers, that no place in the land of the Jews was found worthy for the altar of the Lord to be built; but in the land of the Gentiles a place is chosen where the angel is seen and the altar of the Lord is built, and thus the wrath of the almighty Lord is appeased. Then already was prefigured the fact that in the hearts of the Jews no worthy place could be found to offer spiritual victims; the land of the Gentiles, that is, the conscience of Christians, is chosen as the plac...
Some of his [humanity’s] petitions God grants him promptly (I mean those without which no one can be saved), but some He withholds from him. And on certain occasions He restrains and dispels from him the scorching assault of the enemy, while on others, He permits him to be tempted, that this trial may become to him a cause for drawing near to God (as I said before), and also that he may be instructed and have the experience of temptations. And such is the word of Scripture: “The Lord left many nations, without driving them out; neither delivered He them into the hands of Jesus [Joshua], the son of Navi, to chastise the sons of Israel by them, and that the tribes of the sons of Israel might be taught, and learn war.” For the righteous man who has no consciousness of his own weakness walks on a razor’s edge, and is never far from falling, nor from the ravening lion—I mean the demon of pride. And again, a man who does not know his own weakness falls short of humility; and he who falls sho...
Divine grace ever stirs up the will of human beings, not so as to protect and defend it in all things in such a way as to cause it not to fight by its own efforts against its spiritual adversaries, the victor over whom may set it down to God’s grace, and the vanquished to his own weakness, and thus learn that his hope is always not in his own courage but in the divine assistance and that he must ever fly to his Protector. And to prove this not by our own conjecture but by still clearer passages of holy Scripture let us consider what we read in Joshua the son of Nun: “The Lord,” it says, “left these nations and would not destroy them, that by them he might test Israel, whether they would keep the commandments of the Lord their God, and that they might learn to fight with their enemies.” And if we may illustrate the incomparable mercy of our Creator from something earthly, not as being equal in kindness but as an illustration of mercy: if a tender and anxious nurse carries an infant in h...
