Remember: Jekyll represents how unchecked ambition and denial can destroy even the most respectable person. His transformation from respected doctor to tortured victim shows the dangers of trying to eliminate our darker impulses rather than controlling them.

Key insight: Hyde isn't a separate person - he's what Jekyll becomes when he removes all moral restraints. This makes him far more terrifying than any simple villain because he represents the potential for evil within us all.

Character significance: Utterson shows that ordinary goodness and loyalty are more valuable than Jekyll's brilliant but dangerous experiments. He represents the stable moral foundation that Jekyll abandons in his quest for transformation.

Thematic importance: Lanyon's breakdown shows that some truths are too terrible to bear. His fate warns us about the dangers of uncovering the darkest aspects of human nature - sometimes ignorance truly is bliss.