A prophetic promise guarantees the future revival and ultimate glory of the Davidic dynasty. This renewal is destined to take place in Zion, anchoring the future establishment of the kingdom in its rightful time and place [אבן עזרא, מצודת דוד, מאירי].
The future strength of this royal line is compared to a sprouting horn. Just as animals rely on their horns for combat and displays of dominance, the government of David will experience a massive surge in strength and authority [מצודת ציון, מלבי״ם, רד״ק]. The concept of sprouting points directly to the future Messiah. It suggests that even when the royal line appears entirely dry and lifeless, it will suddenly grow and flourish [רד״ק]. Through this unexpected growth, God will publicly bestow honor upon the kingdom, raising up a fresh and powerful government for all to see [ביאור שטיינזלץ, מאירי].
Alongside this physical might, God promises to carefully prepare a lasting lamp for the king, an idea that perfectly mirrors the growth of the kingdom's power [אבן עזרא, מצודת ציון]. This lamp represents a brilliant, far-reaching rule [מצודת דוד]. A king acts as a guiding light for his nation, and God readies an eternal illumination to honor the anointed rulers of David's line [רד״ק, מאירי, ביאור שטיינזלץ].
These divine guarantees serve as a direct response to earlier prayers. The promise of renewed strength and power answers the plea made for the sake of David, God's servant, while the readiness of the burning lamp responds to the request that God not turn away His anointed [מלבי״ם].
Ultimately, there is a clear distinction between the different eras of this royal line. During the time of the First Temple, the kingdom only experienced the reality of the prepared lamp, which offered merely a partial light. The complete fulfillment of the promise—the mighty, sprouting strength of the kingdom—is reserved entirely for the future, when the dynasty will be revealed in its absolute peak of glory and power [אלשיך].