Shared ground
Isaiah 44:18–20 interprets idol-making as an intellectual and moral breakdown. The text’s explicit claims emphasize lack of knowing and lack of honest reflection (v.18–19), pictured as perception and understanding being blocked. The prophet then spotlights a concrete contradiction: the same wood used for fire and food is later treated as holy and bowed to (v.19). The outcome is self-deception: the person relies on what cannot sustain (“feeds on ashes”) and cannot even name the obvious—“a lie in my right hand” (v.20).
The passage assumes that worship is never only external behavior; it is tied to what a person recognizes as real and trustworthy. The idol is described as false not merely because it is handmade, but because it cannot do what the worshiper implicitly expects (help, rescue, security).
Where interpretation differs
One main question is who is responsible for the shut-down perception in v.18 (“he has shut their eyes… their hearts”). Some read this as divine judgment: God confirms people in the blindness they have chosen. Others read it as a general description of what idolatry does to a person (or what people do to themselves): devotion to a false object results in dulled perception.
A smaller question is what “deliver his soul” means in v.20. Some hear “soul” mainly as life and survival; others hear it more broadly as the self—one’s whole future and well-being.
Why the disagreement exists
The grammar (“he has shut…”) can naturally be heard as an outside actor, but the surrounding logic stresses self-deception (“a deceived heart has turned him aside”). Also, “soul” can refer to a person’s life or the person as a whole in ordinary Hebrew usage, so readers decide based on context rather than a single word.
What this passage clearly contributes
This text contributes a sharp biblical account of idolatry as false reasoning that becomes psychologically entrenched. It explains how contradiction can become invisible: ordinary materials are re-labeled as sacred, and the worshiper loses the capacity to ask the simplest diagnostic question. The “lie in my right hand” underscores that the trusted object is not merely inadequate but fundamentally false—an untrue basis for confidence and “rescue.”