Charles Spurgeon Commentary Isaiah 44:18-20

"They know not, neither do they consider: for he hath shut their eyes, that they cannot see; and their hearts, that they cannot understand. And none calleth to mind, 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; a deceived heart hath turned him aside; and he cannot deliver his soul, nor say, Is there not a lie in my right hand?" — Isaiah 44:18-20 (ASV)

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

As those who are mad will sometimes devour ashes, so surely people who worship things that they have made or bought must be mad: He feeds on ashes.