* The duality of human nature: This is the most prominent theme. The novel explores the inherent conflict between good and evil within every individual. Jekyll represents the respectable, well-intentioned side of human nature, while Hyde embodies the dark, primal urges that lurk beneath the surface.
* The dangers of suppressing one's true nature: By attempting to suppress his darker impulses, Jekyll ultimately unleashes them in the form of Hyde. The story suggests that denying or repressing parts of oneself can be destructive.
* The power of science and its potential for misuse: Jekyll's experiments with transforming into Hyde represent the hubris of science, the idea that human beings can play God and tamper with nature. The story cautions against the unchecked pursuit of knowledge and its potentially harmful consequences.
* The consequences of sin and redemption: Hyde's actions represent the consequences of indulging in evil desires. The story also explores the possibility of redemption, as Jekyll tries to atone for his actions and ultimately faces the consequences of his choices.
* The nature of identity: Jekyll's transformation into Hyde raises questions about the nature of identity. Is identity fixed or fluid? Can one truly separate oneself from the darker aspects of their personality?
* Social hypocrisy and Victorian morality: The novel critiques Victorian society's rigid moral code and the hypocrisy that often underlies it. Jekyll's transformation into Hyde exposes the dark undercurrents that exist beneath the surface of seemingly respectable society.
These are just some of the major themes explored in "Dr. Jekyll and Mr. Hyde." The novel continues to resonate with readers because it delves into timeless questions about human nature, morality, and the complex relationship between good and evil.