“He feeds on ashes; a deluded heart has led him astray, and he cannot deliver himself” (v20). God warned Israel not to fall into the idolatry of their neighbors, for “all who fashion idols are nothing. The things they delight in do not profit” (v9). Isaiah described how ridiculous it was that people burned part of a log for fire and carved the rest into an idol. Worshipping these empty things, just like our modern idols of money, status, work, and pleasure, revealed a “deluded” heart.
“I will pour water on the thirsty ground” (v3). Other objects of worship leave us dry, empty, and ultimately betray us. Only Jesus offers living water that satisfies.