Query: According to Shields, which of the books lessons are fundamental and universal?
Context: Charles Shields, who has written the only book-length biography of Harper Lee to date, offers the reason for the novel's enduring popularity and impact is that "its lessons of human dignity and respect for others remain fundamental and universal". Atticus' lesson to Scout that "you never really understand a person until you consider things from his point of view—until you climb around in his skin and walk around in it" exemplifies his compassion.