Final answer:
The text from 'The Strange Case of Dr. Jekyll and Mr. Hyde' explores the duality of human nature through the two personas of Dr. Jekyll and Mr. Hyde, reflecting Victorian society's conflict between respectability and the hidden monstrous self.
Step-by-step explanation:
The excerpt from The Strange Case of Dr. Jekyll and Mr. Hyde illustrates the underlying theme of duality within human nature, which is prominently displayed throughout this celebrated Gothic novel. It depicts the struggle between the respectable facade of Dr. Jekyll and the hideous criminal persona of Mr. Hyde, symbolizing the conflict between good and evil within one man. The narrative sets the tone for a dark and mysterious exploration of identity and morality within Victorian society.