Isaiah 44:18-20

Isaiah 44:18-20. They have not known nor understood: for he hath shut their eyes, that they cannot see; and their hearts, that they cannot understand. And none considereth in his heart, neither is there knowledge nor understanding to say, I have burned part of it in the fire; yea, also I have baked bread upon the coals thereof; I have roasted flesh, and eaten it: and shall I make the residue thereof an abomination? shall I fall down to the stock of a tree? He feedeth on ashes:

As madmen will sometimes devour ashes, so surely men who worship things that they have made or bought must be mad: "He feedeth on ashes."