Cyrill of Alexandria
Open your gates, O Lebanon, and allow the blaze to consume your cedars; let the pine trees lament, for the cedar has fallen, and the mighty have faced great loss. The implications of this statement lead us to reflect on further concepts. After thoroughly detailing how the nations are called to Christ through faith, it unmistakably anticipates the future disbelief of the children of Israel, particularly during Christ’s earthly existence. Consequently, the temple and Jerusalem itself were destined for destruction, just as the cities of Israel would fall and their inhabitants perish. This calamity was executed by the Romans, led by Vespasian and Titus.
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It seems unnecessary to elaborate on each of the tragedies that struck the Jewish cities and their people due to their rejection of Christ; those interested may consult the writings of Josephus for a detailed account.
The focus shifts to those who are genetically from Israel. Why does he liken Judah to Lebanon? Lebanon is a mountainous region adorned with lush vegetation and expansive forests. Likewise, the land of Judah is populous with countless inhabitants, including priests and leaders from the tribe of Judah, well-known to all for their esteemed authority and renowned like the tallest cedars or cypress trees. Because they acted wickedly toward Christ—taking "the key of knowledge" and neither entering nor allowing others to enter (Luke 11:52), they ultimately crucified Him despite recognizing Him as the heir (Luke 20:14)—they faced total destruction, along with their homes and cities.
Thus, as noted earlier, he refers to Judea as Lebanon and likens its leaders to the tallest trees, elevated above the rest, excessively so. The ease of the city's downfall is captured by the phrase "Open, O Lebanon, your doors, so the fire may consume your cedars; let the pines lament, for the cedar has fallen.” By naming Lebanon, equating the Jewish land to a mountain, he should have correspondingly compared the inhabitants to pines and oaks. The reference is evidently to the people, as indicated by the statement that "the nobles are greatly impoverished."
The nature of this impoverishment is somewhat clarified by saying, "Let the pines weep, for the cedar has fallen." When the Romans devastated the cities, many of the distinguished inhabitants were captured. Those who had not yet suffered this fate mourned for the captives, wept for themselves, and were filled with despair and fear, as they would soon share the same fate. This, I believe, captures the essence of “Weeping for the pines, for the cedar has fallen.” The mention of the oaks of Basanitidae likely refers to the people of Jerusalem, as Basanitidae is a region in Judea known for its fertility and towering trees. Since many prominent individuals were in Jerusalem—particularly priests and leaders of the people—they are called the oaks of Basanitida, mourning for the destruction of the rich forest around them: they understood that many from the wider region had perished, struck down in battle by their fierce enemies.
The dense forest he refers to that was cut down can likewise be understood to signify the very populace of Jerusalem, who were perishing from famine and warfare, while the oaks of Basanitida—the rulers—grieved for them.