6. Be strong and of good courage. After he had shown that God would be with them, for their help, he exhorts the people to firmness and magnanimity. And surely this is one means of confirming our courage, to be assured that the assistance which God promises will suffice for us: so far is it from being the case, that our zeal and energy in acting aright is impaired, by our ascribing to the grace of God what foolish men attribute to their own free will. For those who are aroused to strenuous action in reliance on their own strength, do no more than cast themselves headlong in their senseless temerity and pride. Let us understand, then, that all exhortations are fleeting and ineffective, which are founded on anything else but simple confidence in the grace of God. Thus Moses assumes, as his ground of exhortation, that God will fight for the Israelites. It must, however, be observed that the people were animated to the perseverance of hope, when God declares that He will be their helper even to the end, by which lesson that impious hallucination is refuted, whereby the Popish theologians have fascinated the world. They deny that believers f233 can be certain of God’s grace, except as to their present state. Thus do they hold faith in suspense, so that we may only believe for a day, and even from moment to moment, whilst we are in uncertainty as to what God will do with us on the morrow. Whereas, if faith corresponds with God’s promises, and is, as it were, in harmony with them, it must needs extend itself to our whole life, nay, even beyond death itself; for God removes all doubt as to the future by these words, “I will not leave thee nor forsake thee.”
7. And Moses called unto Joshua. It hence appears that those, upon whom a public charge is conferred, have need of a twofold confirmation: for, after having addressed a general instruction to the whole people, he directs his discourse peculiarly to Joshua himself, as to one whose business it was to set an example of bravery to others, and whom severe contests awaited. Since, then, it is more difficult to lead all the rest than to follow a leader, it is necessary that he, who is set over many, should far excel them. But, inasmuch as no one call do anything of himself, we must seek of God whatever we want. Wherefore that, which Moses had enjoined upon the whole people, he now repeats to a single individual, because upon him the burden of ruling them was thrown. And this must be more carefully observed, because, in proportion to the degree of honor, in which a man is placed, so does he disdainfully look down upon all admonitions; whence it is the case that those, who are eminent in the world, carelessly reject the exhortations of God’s servants. But Moses thoroughly overthrows all such fastidiousness, when he shows that all, who are in authority, should not only be instructed together with others, but even more urgently dealt with.
When Moses, in this place as well as above, forbids believers to give way to fear or dread, it must be observed that. he would not have them so deprived of all feeling, as to be hardened into indifference to every danger, or to suppose, as some madmen do, that there is no such thing as bravery without stupidity, but only possessed of such confidence as may overcome all fears, which impede the course of their calling. Appropriately does the Apostle extend this lesson further, where he wishes to correct avarice, which arises from over-anxiety, whilst wretched men do not sufficiently reflect what it is to have God for their perpetual helper. (Hebrews13:5.)