This passage shows how Macheath has developed the perfect artifice to disguise who he truly is. As Peachum and his wife realize that their daughter is entangled with none other than Macheath, Brecht sets up the play’s central moral quandary (if it can be called that, given all the characters’ lack of morals.) Peachum is a corrupt individual, but still sees himself above the likes of the dangerous Macheath—the tension between the two men and their claims of ownership to Polly will form the central drama of the opera.