There are three levels upon which the individual and collective perfection of Israel must be based. These are the return to nature, to human ethics, and to the national foundation. Supernal holiness rests only upon these three. The highest divine service is connected directly to nature. But this supernal holiness was polluted by human defilement, which destroyed the service of nature and turned it into a monster of idolatry rather than a firm foundation for supernal idealism.
Engaging in the "Chapter of song" is the foundation of this return to nature. This is a lowly return that is high, that rises beyond all national jealousy, lifting man to become an elevated brother to his other brothers, the creations of the Almighty, who all know their Maker and take pleasure in the glory of His activity.
Orot Hakodesh II, pp. 493-94