Courage and Assumptions

What did Jem and Scout learn from their experience with Mrs Dubose?
They've learnt never to make assumptions before 'you climb into his skin and walk around in it'. They believed that Mrs Dubose was bitter and heartless because she was rude about Atticus, however after she died Atticus revealed that she was the 'bravest person I ever knew'.
Scout in particular also learnt what true courage was, when Jem and Scout went to her house to read to her everyday, Mrs Dubose set the alarm clock later each time. Therefore each day she avoided taking her morphine for a longer length of time. Atticus wanted Jem and Scout to learn that courage was not somebody waving around a gun, but somebody who never gave up even if it seemed hopeless. Mrs Dubose was very ill and knew that she only had a few months to live, however she promised herself that she would stop taking morphine before she died even if it would have made dying much easier and painless