'Wall' in the Bible

The wealth of the rich [is] {his strong city}, and like a wall, it is high in his imagination.

and behold, it was overgrown--all of it was covered [with] thorns, its surface with nettles, and {its stone wall} was broken down.

A breached city [where] there is no wall [is like] a man who {has no} self-control for his spirit.