I have never been rich by the standards of most of my neighbors, coworkers, friends, and family members. Though by some I have had more than they. Still, the point is my wealth is not my fortified city because I do not have wealth. No wealth-laden wall exists to scale in my chauffeurs. An enemy can come in and ravage my life except for the fortitude of the name of the Lord as verse 10 states.
The point of the proverb in verse 11 is that even if I am extravagantly or secretly wealthy it is not assured to always keep enemies and troubles at bay. Many cities and countries thought they had built the perfect wall to keep them safe. Yet, every fortified city and citadel had fallen to a persistent and cunning enemy. Troy was conquered with a horse full of fighting men. Jericho’s imperative walls fell at the sound of trumpets and shouts. Rome’s armies abandoned the city to the Mongols. USSR’s iron wall came down. Tenochtitlan’s water wall was not enough to stop the conquistadors and the neighboring villages. The same is the safety of the wealth of the rich. It cannot always withstand.
However, the proverb promise is true, “The name of the LORD is a strong tower; the righteous run to it and are safe.”