What is a wall?
A wall is a boundary. It says this is where your domain ends and my domain starts. A wall protects those within from harm. John 10 describes a sheepfold. You can tell the good guys from the bad guys because the thieves and robbers climb over the wall.
It is highly irresponsible to not have good boundaries in your life. Even to have boundaries around your own behaviors so that you can act responsibly and show propriety in your life.
A life without a boundary invites corruption.
A life without a boundary accepts all evil as normal.
A life without a boundary disrespects yourself.
A life without a boundary is shapeless.
A life without a boundary is meaningless.
A life without a boundary is open to any shifting wind.
A life without a boundary is lawless.