What lesson did the Blue man teach Eddie?

Eddie learns that every life has a purpose, even if that purpose does not become clear until after death. The Blue Man reminds Eddie that "fairness does not govern life and death” (48). He illustrates this idea by describing young Eddie's innocent yet crucial role in his own death. As a whole, this encounter also emphasizes the interconnectedness of humanity. No matter how alone a person thinks he or she is, each action has a ripple effect that may never make sense to the living.