What quote shows how Scout grew morally through acting cooperatively with other characters in the story?

At the end of the book Scout walks Boo Radley home. No more is he the monster that hides on the street. Boo is now a friend: a benevolent phantom. She sees Boo as a friend who came to her rescue. At the end of the book, Scout finally says a visible Arthur and simply says "hey Boo" like she's known him for a long time.