The spirit; either
1. Their courage. But of that he spake Isaiah 19:1. Or,
2. Their understanding, as it is explained in the next clause; for the word spirit is oft put for the reasonable soul, as Ecclesiastes 3:21, Ecclesiastes 12:7, and for the thoughts of the mind, as Proverbs 29:11 Eze 13. 3. They shall seek to the idols, as not knowing what to do without the help of a higher power.