Science Versus Religion
The tension between scientific progress and religious faith was massive in Victorian society, and Jekyll embodies this conflict perfectly. As a scientist, he relies on rational methods and evidence, yet he lives in a deeply Christian society surrounded by religious texts.
Jekyll's transformation has clear religious connotations - Hyde promises Lanyon that his "sight shall be blasted" when the truth is revealed, and describes the change as a miracle. This blends scientific and spiritual elements in a deeply unsettling way.
Stevenson criticises the hypocrisy of being publicly religious whilst privately sinful. Jekyll becomes "distinguished for religion" through charitable deeds, but this is just another mask. He uses Hyde to avoid dealing with his guilty conscience rather than genuinely reforming.
The conflict between Lanyon and Jekyll represents two approaches to science: Lanyon sticks to conventional methods, whilst Jekyll pushes into "mystic and transcendental" territory. Jekyll's dangerous experimentation with human nature - which Christians saw as God's creation - ultimately leads to his destruction.
Key Insight: Jekyll's science becomes sinful because he uses it for selfish reasons rather than genuine discovery.