"Even wicked men must not be wronged. God gives and preserves outward blessings to wicked men; these are not the best things, he has better in store for his own children." - Matthew Henry
Even in the instance of Israel conquering some lands east of the Jordan, they were to go about the deed in a passive and civil way, saying "Let me pass through your land. I will only go by the road" (2: 27) letting the victory come to them simply as God should send it. Whereas, in the conquering of the cities of Canaan, they were to go about the conquest with fierce activity. So also, believers are to seek first the kingdom of God, to be in the matter of entering heaven as the violent who storm the gate by force, cutting off hands and eyes that might hinder them, giving up all that they might have Christ, and taking every thought captive to the obedience of Christ; but in matters of the present, earthly life, they are to be content with plenty or hunger, abundance or need; to be anxious for nothing but trust that all needful things will be added to them by their heavenly Father. Canaan is to be had at all cost. Christ has gained it for us and we follow Him in his victory march, so let us not fret that Esau should have Seir or that Ammon have Moab, so long as we shall arrive in God's country ere long.