Their land also is full of idols; they worship the work of their own hands, that which their own fingers have made:
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Cassiodorus Senator
AD 585
Vanity is the general term for vices, but vain in the particular sense means that which is found alien to God. Just as trusting in the Godhead is fruitful constancy, so deviating from him is the vanity that perishes.… So those who burned with the most base love of idols are convicted, and the phrase is to be pronounced as a rebuke, as if the words were, “Why do you love the vanity by which you perish?” We ought to love things that are beneficial, not harmful, for it is better to curse the things that cause the punishment of lasting damnation to afflict us. - "Exposition of the Psalms 4.3"
Someone might ask, what is wrong with having silver or horses, particularly when what the people believed was not rigorous? How should we respond? The prophet was not criticizing the use of these possessions but the misuse of them. When he said, “Woe to the mighty,” he was not condemning them for having possessions but for hoarding so much more than they needed. - "Commentary on Isaiah 2.7"