Verbal irony presents itself well in Stevenson's story (Stevenson 1-78). "I am quite sure of him," replied Jekyll, "I have grounds for certainty that I cannot share with anyone." (Stevenson 30). Jekyll is speaking about his good friend Mr. Hyde, whom no one knows is his divided "other" personality (Stevenson 30). Literally, Jekyll knows Hyde very well, but cannot disclose certain personal information about Hyde's life that he does not wish to share; yet the reader finds out later, that Jekyll is merely looking for a loophole in order to diverge from talking about his evil alter ego (Stevenson 30). Stevenson puts subtle details into the things his characters say and do, and one who is smart will catch the verbal ironies that sprout from these sayings (Stevenson 1-78).
As shown throughout the Strange Case of Dr. Jekyll and Mr. Hyde, Stevenson examines the duality of human nature and how it can affect the lives of anyone.
The multiple sides of a person are most clearly illustrated by the revelation that Mr. Hyde and Dr. Jekyll are the same person. Stevenson lays the evidence for the extreme duality found in human nature in Hyde’s powerfully vicious and violent characteristics contrasting with Jekyll’s