The future redemption is pictured as an era of immense spiritual illumination, a time when natural sources of light are completely overshadowed by God's direct and constant presence. In this vision of comfort, light serves as a powerful symbol of salvation, joy, and divine success.
The primary approach among commentators is that the promise of no longer relying on the sun or the moon is metaphorical. God's salvation and goodness will be so overwhelming that the natural light of the sun and moon will seem entirely insignificant in comparison [רד״ק, ביאור שטיינזלץ, צאינה וראינה]. The people of Israel will simply not need the sun during the day or the moon at night, because the radiant presence of God will completely replace them [רש״י, אבן עזרא, מצודת דוד].
Some observers note an astronomical reality within this promise: since the moon only reflects light and does not produce its own, the sun will no longer need to shine upon the moon to create a nighttime glow [מלבי״ם]. Natural lights are strictly limited by time, with the sun ruling the day and the moon appearing at night. In sharp contrast, God will provide an eternal, unbroken light that shines continuously, day and night alike [שד״ל, אבן עזרא, מצודת דוד].
This constant illumination reflects a new reality completely free of barriers. Just as the moon's full light is sometimes hidden from our view depending on its position, the past sins of the people created a spiritual separation that led to their exile. In the future, however, all of these dividing screens will be removed, allowing God's light to shine upon the nation openly and without interruption [אהבת יהונתן].
As a result of this unending illumination, the people will find their ultimate pride and beauty in God's honor and the great goodness He bestows upon them [רד״ק, מצודת דוד]. Furthermore, this dynamic highlights a deep concept of spiritual reflection. During times when God's direct light is hidden from the general public, the righteous and the prophets function much like the moon. They absorb God's light and radiate it outward to the masses, ensuring that His unique presence remains their ultimate glory [מלבי״ם].