feedeth on ashes - figuratively, for the idolater delights in what is vain (Pro 15:14; Hos 12:1). “Feedeth on wind.” There is an allusion, perhaps, also, to the god being made of a tree, the half of which was reduced to ashes by fire (Isa 44:15-17); the idol, it is implied, was no better, and could, and ought, to have been reduced to ashes like the other half.
deceived heart - The heart and will first go astray, then the intellect and life (Rom 1:28; Eph 4:18).
lie in ... right hand - Is not my handiwork (the idol) a self-deceit?