In the ancient world, a city without walls was completely vulnerable — open to any attack, without defence or security. This is the picture of a person with no self-control: every temptation, every enemy, every destructive force finds an open door. Self-control is not merely a virtue — it is structural protection.
Memory phrase: Rule yourself. Guard your walls.
Talk about it: What happens to a city with no walls? What happens to a person who cannot control themselves?
Prayer: God, help me control myself so I stay safe and strong.