A profound and rapid shift in the balance of human society is about to unfold, illustrated through striking transformations in the natural world. The promise of change comes with an assurance that it will happen very shortly. The repeated emphasis on a brief span of time highlights just how close this moment is [רד״ק, מצודת ציון]. This serves as a direct response to those wondering why God does not immediately reward the righteous and punish the wicked, making it clear that divine retribution and reward are fast approaching [מצודת דוד]. Historically, this vision was delivered during the reign of King Ahaz and was destined to be fulfilled quickly during the days of King Hezekiah, specifically through the miraculous defeat of Sennacherib [רד״ק, שד״ל]. Furthermore, such a sudden reversal is effortless for God, particularly if the people choose to repent [רש״י].
To illustrate this impending shift, a sharp contrast is drawn between two distinct landscapes. Lebanon represents a towering forest of tall cedar trees or a high, formidable mountain. In contrast, the Carmel is a lower, more accessible region known for its fertile fields of grain, vineyards, and fruit [רד״ק, שד״ל, מצודת ציון, ביאור שטיינזלץ]. The primary approach among commentators is that the transformation of Lebanon into the Carmel, and the Carmel into a dense forest, symbolizes a moral and social upheaval where God humbles the proud and elevates the lowly. The towering Lebanon stands for the arrogant and wicked who have oppressed others. They will soon lose their power and be brought low like the Carmel. Conversely, the Carmel represents the humble and faithful who currently lack power. They will be lifted up, gaining the strength, greatness, and formidable presence of a mighty forest [רד״ק, שד״ל, מצודת דוד, ביאור שטיינזלץ].
Another perspective on this reversal suggests a spiritual transformation. The wicked, compared to barren trees of Lebanon, will repent and begin producing the fruit of good deeds like the Carmel. At the same time, the righteous, who are currently as soft and vulnerable as the Carmel, will be granted the firm strength of forest trees [מלבי״ם]. Taking a different approach, the transformation of the Carmel into a forest can be understood as a tremendous demographic blessing. Rather than symbolizing power, the spreading forest represents a population boom where settlements and fields will expand, and the people will multiply until they are as dense and numerous as trees in a woodland [רש״י].
In stark contrast to these interpretations that view the transformation as a positive message of justice, repair, or prosperity, a different viewpoint reads this as a dark warning of an impending famine. According to this understanding, the once fruitful Lebanon will diminish and be reduced to the level of the Carmel, while the fertile Carmel itself will be ruined, turning into a desolate and empty forest [אבן עזרא].