The imagery of the repeated destruction of the idols and the hiding in the caves takes an interesting twist in verses 20 and 21. Note that in the destruction of the idols theme, rather than destroy them, man will attempt to take them with him as he enters the caves. These idols that he expects to be representations of his gods he will take with him for protection into the caves. All of this is for the fear of the Lord. The idols in the caves will be no more effective from the caves than they were in the hills and mountains. Symbolically, the gods represented by the idols are also attempting to hide from the Lord in the caves and dark places.