5. There shall not any man, etc As a contest was about to be waged with numerous and warlike enemies, it was necessary thus to inspire Joshua with special confidence. But for this, the promise of delivering over the land which God had given, would ever and anon have become darkened; for how vast the enterprise to overthrow so many nations! This objection therefore is removed. And the better to free him from all doubt, he is reminded of the victories of Moses, by which God had made it manifest that nothing was easier for him than utterly to discomfit any host however great and powerful. Joshua, therefore, is ordered to behold in the assistance given to Moses the future issue of the wars which he was to undertake under the same guidance and protection. For the series of favors is continued without interruption to the successor.
What follows is to the same effect, though it is more fully expressed by the words, I will not fail thee, etc Hence the Apostle, (Hebrews 13:5,) when wishing to draw off believers from avarice, makes an application of these words for the purpose of calming down all anxieties, and suppressing all excessive fears. And in fact, the distrust which arises from anxiety kindles in us such tumultuous feelings that on the least appearance of danger, we turmoil and miserably torment ourselves until we feel assured that God both will be with us and more than suffice for our protection. And, indeed, while he prescribes no other cure for our timidity, he reminds us that we ought to be satisfied with his present aid.