The downfall of a nation often begins with a pervasive sense of self-delusion and arrogance that infects every level of society. A severe warning is directed at the northern kingdom, referred to as Ephraim to represent the ten tribes [אבן עזרא], with a specific focus on its capital city, Samaria. Instead of waking up to the reality of an approaching disaster, the entire society chose to entrench itself in excessive self-confidence.
Commentators offer different perspectives on the nature of the nation's awareness. The primary approach among commentators is that this points to a harsh future awakening. When God carries out His decree and disaster strikes, the survivors will feel the devastation firsthand. They will finally realize that the prophet's warnings were true and their own arrogant boasts were nothing but lies [רד״ק, מצודת דוד, שד״ל]. Alternatively, this awareness might describe how widespread their current arrogance was. The boastful attitude was not limited to a few individuals but was common knowledge, echoing in the mouths of the entire nation from the provincial cities of Ephraim to the royal capital of Samaria [מלבי״ם]. A completely different perspective suggests this reflects the corrupted nature of the nation's wisdom. Having abandoned the teachings of God, their entire focus and intellect shrank into a shallow pursuit of honor, luxury, and the construction of magnificent homes. They lived in the foolish illusion that no enemy could ever breach their walls [אברבנאל].
This national mindset is characterized by two complementary forms of arrogance. The first is an outward pride, a public display of superiority where a boastful person might actually know deep down that their confidence is a lie. The second is a deep internal blindness, a state where people genuinely and mistakenly believe that their power and strength will last forever [מלבי״ם]. Driven by this overwhelming sense of superiority, and perhaps motivated by a desire to appear greater than the royal dynasty of David which they viewed as weak [אברבנאל], the people would openly speak their boastful words [רש״י, ביאור שטיינזלץ]. They held onto a false confidence that even if ruin were to strike, they would simply rise again and replace whatever was destroyed with something far better and much more magnificent [רד״ק].