* Skepticism towards Victorian Morality: Stevenson seems to be critical of the rigid, hypocritical morality prevalent in Victorian society. He portrays the outward respectability of figures like Dr. Jekyll as a facade hiding darker, more primal urges. This can be seen in the way Jekyll's "evil" side, Mr. Hyde, is a manifestation of those urges that Victorian society deemed unacceptable.
* Fascination with the Dual Nature of Humanity: The central theme of the novella is the duality of human nature. Stevenson seems fascinated by the idea that every individual possesses both good and evil within them, and that these forces are constantly in conflict. He explores this theme through Jekyll and Hyde, who embody the two sides of the same coin.
* Warning Against Repression: Stevenson suggests that repressing our darker desires can lead to destructive consequences. Jekyll's attempt to suppress his "evil" side ultimately backfires, leading to his downfall. This implies a caution against the dangers of societal pressures and the need for a balance between our good and bad impulses.
* Interest in the Supernatural: While the story is often interpreted as a psychological exploration, there are hints of the supernatural. Hyde is described as having an almost demonic presence, and the transformation between Jekyll and Hyde is presented as something uncanny and beyond explanation. This suggests Stevenson's interest in the darker, more mysterious aspects of human experience.
Ultimately, Stevenson's attitude is multifaceted and invites interpretation. He invites readers to contemplate the complexities of morality, the nature of good and evil, and the potential consequences of repressing our true selves.