ישעיהו, פרק מ״ד, פסוק ט״ז

The utter foolishness of idolatry is fully exposed when a person takes a single piece of wood, uses a portion of it for basic daily needs, and transforms the leftover piece into a deity. The wood intended to become a god acquires no actual holiness. Instead, it behaves exactly according to the ordinary laws of nature, offering the person nothing more than simple material comforts.

A person takes a portion of the whole piece of wood for completely mundane purposes [רד״ק, מצודת דוד]. Burning it in the fire [מצודת ציון, ביאור שטיינזלץ], he extracts two practical benefits: cooking his food and warming his body [רד״ק, שד״ל, צאינה וראינה]. He roasts meat over the fire and eats until he is completely satisfied, experiencing a successful meal without any lack [מלבי״ם].

Using one piece of the wood for ordinary, even lowly needs while reserving the other piece for worship highlights the absurdity of the idolater. He essentially tricks and pleases himself twice. First, he enjoys the temporary physical comfort provided by the fire. Then, he indulges in the false hope that the remaining piece of wood will somehow save him in times of distress [רד״ק]. This exact concept forms the foundation for the Torah's command against breaking the stones of the altar. The prohibition ensures that half of a holy stone does not end up discarded disgracefully in the street while the other half is used for sacred service [צאינה וראינה].

As the person enjoys the natural fire, he cries out with an exclamation of joy and pleasure [אבן עזרא, מצודת ציון, רד״ק]. He happily declares that his body has finally become warm [שד״ל, מצודת ציון, מצודת דוד], and he notes that he has seen the glowing flame [מצודת ציון, אבן עזרא, ביאור שטיינזלץ]. By experiencing both the heat he can feel and the light he can see, he proves to himself that this is merely a regular burning log and not a miracle [מלבי״ם]. The primary approach among commentators is that he literally enjoys looking at the pleasant light of the flame after warming up [ביאור שטיינזלץ]. However, there is another perspective suggesting that his claim to see the light actually means he feels a sense of overall relief and rescue from harm [אבן עזרא בשם רב סעדיה גאון].