When does Atticus say, "You never really understand a person until you consider things from his point of view"?

In chapter three, Scout has had a bad day at school.  She comes home in a bad mood about what had happend with her teacher and asks Atticus if she can stay at home and not return to school.  In my edition it is on page 36.  Atticus says,

"First of all," he said, "if you can learn a simple trick, Scout, you'll get along a lot better with all kinds of folks.  You never really understand a person until you consider things form his point of view-"

"Sir?"

"-Until you climb into his skin and walk around in it."