Scout takes Boo—“Mr. Arthur”—down to the porch, and they sit in shadow listening to Atticus and Heck Tate argue. Heck insists on calling the death an accident, but Atticus, thinking that Jem killed Bob Ewell, doesn't want his son protected from the law
It means you should be concerned of your ownself, and how <em>you</em> could make the world a better place. Instead of being concerned about and with the rest of the world