4. From what God was now about to do for them he infers an assurance of what he would yet further do. This he mentions first, so much was his heart upon it, and so great a satisfaction did it give him (v. 10): "Hereby you shall know that the living God (the true God, and God of power, not one of the dead gods of the heathen) is among you, though you see him not, nor are to have any image of him, is among you to give you law, secure your welfare, and receive your homage,—is among you in this great undertaking now before you; and therefore you shall, nay, he himself will, without fail, drive out from before you the Canaanites." So that the dividing of Jordan was intended to be to them, (1.) A sure token of God's presence with them. By this they could not but know that God was among them, unless their unbelief was as obstinate against the most convincing evidence as that of their fathers was, who presently after God had divided the Red Sea before them, impudently asked, Is the Lord among us, or is he not? Exod. xvii. 7. (2.) A sure pledge of the conquest of Canaan. "If the living God is among you, expelling he will expel (so the Hebrew phrase is) from before you the Canaanites." He will do it certainly, and do it effectually. What should hinder him? What can stand in his way before whom rivers are divided and dried up? The forcing of the lines was certain presage of the ruin of all their hosts: how could they stand their ground when Jordan itself was driven back? When they had not courage to dispute this pass, but trembled at the approach of the mighty God of Jacob (Ps. cxiv. 7), what opposition could they ever make after this? This assurance which Joshua here gives them was so well grounded that it would enable one Israelite to chase a thousand Canaanites, and two to put ten thousand to flight; and it would be abundantly strengthened by remembering the song of Moses, dictated forty years before, which plainly foretold the dividing of Jordan and the influence it would have upon the driving out of the Canaanites. Exod. xv. 15-17, "The inhabitants of Canaan shall melt away, and so be effectually driven out; they shall be as still as a stone till thy people pass over, and then thou shalt bring them in and plant them." Note, God's glorious appearances for his church and people ought to be improved by us for the encouragement of our faith and hope for the future. As for God, his work is perfect. If Jordan's flood cannot keep them out, Canaan's force cannot turn them out again.