Often before, God, by the prophet, had mentioned the folly and strange sottishness of idolaters; but here he enlarges upon that head, and very fully and particularly exposes them to contempt and ridicule. This discourse is intended, 1. To arm the people of Israel against the strong temptation they would be in to worship idols when they were captives in Babylon, in compliance with the custom of the country (they being far from the city of their own solemnities) and to humour those who were now their lords and masters. 2. To cure them of their inclination to idolatry, which was the sin that did most easily beset them and to reform them from which they were sent into Babylon. As the rod of God is of use to enforce the word, so the word of God is of use to explain the rod, that the voice of both together may be heard and answered. 3. To furnish them with something to say to their Chaldean task-masters. When they insulted over them, when they asked, Where is your God? they might hence ask them, What are your gods? 4. To take off their fear of the gods of their enemies, and to encourage their hope in their own God that he would certainly appear against those who set up such scandalous competitors as these with him for the throne.