Dr. Jekyll and Mr. Hyde Science, Reason and the Supernatural. The Duality of Human Nature. Reputation, Secrecy and Repression. Innocence and Violence. Bachelorhood and Friendship. Click to see full answer. Regarding this, what are the main themes in Dr Jekyll and Mr Hyde?The key themes in Dr Jekyll and Mr Hyde are scientific development, duality of mankind and the supernatural verus nature debate.Additionally, how is the theme of secrecy presented in Jekyll and Hyde? The theme of secrecy in Jekyll and Hyde. Smog: Refers to Victorian England. Smog hides things and prevents someone from seeing past it. this emphasises the theme of secrecy. Also, what is the theme of duality? The duality of human nature is the main theme of the novel. This is the idea that every human being has good and evil within them. Stevenson shows this duality in the novel with Dr Jekyll’s experiment, but we learn that ultimately what is important is how you behave and the decisions that you make.What is the message of Jekyll and Hyde?The moral message of Robert Louis Stevenson’s The Strange Case of Dr. Jekyll and Mr. Hyde is that man’s soul is paired with both elements of good and evil. These basic elements cannot be separated because man is defined by the conflict within his inner nature and how he deals with this duality.