adverb "truly" emphasise J's certainty on duality of human nature, challenging V belief in moral absolutes
S present psychological theory ahead of it time, reflect emerging ideas of subconscious mind (Freud's id & ego)
"a large, well-made, smooth-faced man of fifty ... every mark of capacity and kindness" chapter 3
Paradoxical description: 50 yr man would typically be etched with wrinkles and signs of age, this paints him as almost artificial, he seems the archetype of a respectable gentleman yet almost to the extent where he seems manufactured.
The word 'kindness' illustrates why Utterson had such an affinity (natural liking) with Jekyll, yet the placement of "mark" next to "kindness" foreshadows a hidden stain on Jekyll's morality.
Foreshadowing: Jekyll's sanitised appearance becomes an ironic counterpoint to the barbaric Hyde lurking beneath, a monstrous reflection of the darkness he seeks to control and his morbid curiosity.
