Matthew Henry on Nahum 3:1-7

When proud sinners are brought down, others should learn not to lift themselves up. The fall of this great city should be a lesson to private persons, who increase wealth by fraud and oppression. They are preparing enemies for themselves; and if the Lord sees good to punish them in this world, they will have none to pity them. Every man who seeks his own prosperity, safety, and peace, should not only act in an upright, honourable manner, but with kindness to all.