Standing on the threshold of the Promised Land presents the Israelites with a profound dual challenge, both military and psychological. Moses must prepare the people to face an enemy that, according to the laws of nature, is entirely unconquerable. Describing the terrifying strength of this adversary is not meant to instill fear, but rather to lay the groundwork for a deep spiritual realization. Their future victory will not be achieved through physical might, nor will it be earned by their own personal righteousness. Instead, it will be an act of Divine grace and providence.
Moses issues a powerful call to the nation, which serves as a demand for deep understanding, careful attention, and the internalization of their new reality [אור החיים, צרור המור, שפתי כהן, ביאור יש״ר]. A fascinating perspective links this call directly to the sin of the Golden Calf. When the Israelites sinned, they forfeited the promise they had made to actively do God's will; thus, Moses urges them to at least uphold the remaining half of their promise, which is to listen and internalize His word [הדר זקנים]. Furthermore, as Moses speaks of the nation crossing into the land, he subtly draws attention to his own personal tragedy, as he himself will not be crossing with them. He harbors a hidden hope that the people will recognize his sorrow and plead for Divine mercy on his behalf [אור החיים].
Most commentators understand the imminent timeframe of this crossing as a way to convey the absolute certainty of the event, as if it were unfolding that very day. However, others explain that the open miracles the people will soon experience at the Jordan River, such as the sudden halting of the waters, will prove beyond any doubt that God is the one advancing before them and fighting their battles [שפתי כהן, אלשיך]. The journey is framed as a true homecoming, a return to the place where the nation fundamentally belongs [רש״ר הירש]. They are meant to inherit the land, a concept that typically implies a peaceful transfer of ownership, much like receiving an estate from a relative. This peaceful connotation stands in stark contrast to the impending reality of having to wage war against massive nations [אוהב גר]. Yet, the idea of inheritance stresses that the land is not a temporary gift that can be easily lost, but an absolute, permanent possession that forever replaces its previous owners [רש״ר הירש, אלשיך].
The looming adversaries are described as greater and mightier than the Israelites themselves. This comparison reveals that the Israelites are indeed a remarkably strong and powerful nation in their own right, but the Canaanite nations are simply stronger [רש״י, מזרחי, שפתי חכמים]. If the Israelites were intrinsically weak, any military success would obviously be attributed to God. However, precisely because they possess formidable strength, there is a distinct danger that they might credit their own power for the triumph. By highlighting the superior might of the enemy, Moses effectively uproots any potential for arrogance [משכיל לדוד]. The enemy holds a daunting double advantage: the human superiority of giant warriors, and the engineering marvel of massive, fortified cities [דברי דוד, אברבנאל]. These fortifications are described with deliberate exaggeration, depicting walls so towering that they appear detached from the earth, reaching all the way into the skies [אברבנאל, רש״ר הירש, שטיינזלץ, ביאור יש״ר].
This overwhelming physical disadvantage raises a profound question regarding why God intentionally populated the land with giants and built such impregnable fortresses in the first place. Ultimately, this insurmountable challenge is a profound act of Divine kindness. By orchestrating a reality where natural conquest is entirely impossible, the people are forced to recognize their Creator and rely completely on Him, thereby achieving their ultimate spiritual purpose [חתם סופר]. This stark depiction of Israel's natural helplessness serves as the foundation for a deeper warning. Just as the nation must understand that their victory does not stem from physical dominance, they must equally guard against attributing their success to their own moral superiority. God is driving out these native populations due to their severe wickedness and because of the ancient oath He swore to the Patriarchs. It is certainly not a reward for the moral perfection of the wilderness generation, who are still characterized as a stubborn and stiff-necked people [מלבי״ם, אברבנאל, רש״ר הירש, צרור המור].