Facing the daunting prospect of entering a land filled with formidable inhabitants, the Israelites are gripped by deep anxiety. Moses steps in to address this despair, offering guidance that is both a psychological strategy and a profound lesson in faith. He makes it clear that his instructions are not his own personal advice, but a direct message from God designed to counter the people's sense of hopelessness [שפתי כהן]. At the same time, his words serve as a gentle reprimand for their lack of faith. When God Himself leads the charge in a divine conflict, there is no place for fear, nor is there any need for human tactics such as sending spies [אברבנאל].
Moses issues a dual warning against giving in to terror, addressing the mental and emotional toll of facing a powerful enemy. The primary approach among commentators understands this as a warning against mental collapse. The people are urged not to let their spirits break [רש״י, שטיינזלץ, ברכת אשר]. This brokenness is closely tied to anxiety, warning against a shattered heart caused by overwhelming dread [אבן עזרא, ביאור יש״ר]. Furthermore, this serves as a twofold instruction: they must not allow themselves to shatter inwardly, nor should they be too afraid to take necessary, practical action [העמק דבר].
Taking a different angle, other scholars focus on the psychological balance of power between the Israelites and their opponents. They suggest the warning is about projecting immense, tyrannical strength onto the enemy [הכתב והקבלה, רש״ר הירש, חומת אנך]. Fear naturally multiplies when people magnify an opponent's strength while focusing on their own vulnerabilities. Therefore, Moses cautions the nation not to attribute such overwhelming power to their rivals that they end up feeling paralyzed.
A precise division of Moses's instructions clarifies this dynamic perfectly [מלבי״ם]. The first aspect of his warning targets the Israelites' self-perception, urging them not to view themselves as weak, fragile, or powerless. The second aspect shifts the focus to how they view the enemy, warning them not to see the land's inhabitants as mighty figures who demand fear.
Ultimately, the key to overcoming both mental brokenness and terror lies in a clear recognition of God's presence. God is the One walking ahead of the camp, and He will fight on their behalf. Just as the Israelites witnessed His salvation and the complete defeat of their enemies in Egypt, they will experience the exact same victory in the new land. With this reality in mind, there is simply no valid reason for them to be afraid [פני דוד, אברבנאל].