Deuteronomy 2:4

4.And they shall be afraid of you. This temptation was the more provoking, when they heard not only that the embassy would be vain, but that although Edom should receive them with injustice and hostility, they were still to abstain from violence and arms. For there might be some reason in this, that when they presented their request in a friendly manner, they would have a legitimate cause of war, if Edom should reject their demands. But this further condition might appear altogether intolerable that they were to do nothing against those who refused to let them pass quietly through their land. Hence, however, it more fully appears how the Israelites were gradually, and by various kinds of chastisement, subdued to obedience, whereas they would otherwise have fiercely and petulantly exclaimed that they had been dealt with unkindly by God; since thus their condition would be worse than the universal law of nations allowed. In this matter, then, their wanderings, for eight and thirty years, had much efficacy in bringing them back to the right way.