The primary function of walls is to provide protection for those within them. The walls afford this protection in two ways;
Even when the enemy forces are camped outside of the city, making noise and threats, the wall creates a barrier that prevents them from being able to enter and do any real harm.
Behind the protection of the walls, the defending soldiers are able to consolidate and build their strength, so that they can drive away the enemy completely.
Our G-dly soul and animalistic soul are in conflict. The G-dly soul is enclothed within the animalistic soul. Our animalistic side seeks to dominate our G-dly soul, leading us to sin and pursuit of worldly desires. The G-dly soul wants to express its light and subjugate the animalistic soul in the service of Hashem.
Our G-dly soul, like the Beis Hamikdash, is a place of incredible holiness. But we need walls to protect our G-dly side from the attacks of our animalistic soul which seeks to bring us down. This protection is also twofold;
Even when our animalistic soul ‘makes noise’ with thoughts of sin and negative emotions, the wall is the protection that prevents it from getting in and actualising these impulses in thought, speech and action of sin.
The protection of the wall also allows us to consolidate and strengthen our G-dly soul, so that we have the spiritual strength to overcome and transform our animalistic side completely.
Our sages teach חומה זו תורה – the wall of spiritual protection is the study of Torah
~ Based on Sefer Maamarim 5693 p508