Mark Twain's: Great Lady

Atticus calls Mrs. Dubose a great lady because she is honest and brave. Honesty is a quality that Atticus values, and teaches to his children. Bravery is always a respectable quality and Atticus Finch finds a southern woman who speaks her mind in their period of time to be brave. On page 149 he says "She was the bravest person I ever knew." Atticus finds these great qualites within Ms. Dubose to be the reason why he thinks she is a great lady.