After a series of harsh prophecies directed at neighboring nations, a profound promise of comfort and quiet emerges for the Israelites. The downfall of these surrounding peoples marks the end of a long era of suffering and harassment at the hands of hostile neighbors, such as Ammon, Moab, the Philistines, Edom, Tyre, and Sidon.
To illustrate this relief, the imagery of sharp briers and painful thorns is used as a double metaphor expressing a single, unified idea [רד״ק, אברבנאל]. These thorny plants symbolize the deep injury inflicted by the surrounding nations, carrying a sting as severe as a malignant disease [רש״י, מצודות]. Specifically, these thorns represent the wicked kings and oppressive regimes that historically targeted the Israelites [רד״ק]. For years, these neighbors treated the Israelites with deep contempt, disrespect, and malicious joy, often going so far as to loot and plunder them [רש״י, רד״ק, שטיינזלץ]. However, once these hostile nations are destroyed and vanish from the world stage, their threat will be completely eradicated. They will never again serve as a source of pain or nuisance.
The ultimate result of this historical shift is a universal recognition of God. Through the dramatic fall of these nations, it will become clear to all that God actively rules the world and fights the battles of the Israelites [המלבי״ם, מצודת דוד]. Expanding on this, the judgment brought upon these nations highlights the eternal bond between God and His people, signaling the gathering of the exiles. While mighty empires like Tyre will fade into complete oblivion, the Israelites will endure, experience salvation, and return to live securely in their homeland [האברבנאל].