"my devil has been caged, and came out roaring"
suggests the theme of duality as it represents jekyll's idea that all humanity has two sides. it also highlights the theme of good vs evil. furthermore, the noun 'devil' compares hyde to satan and religion which links to the statement earlier in the novella "distinguished for religion" which represents how both jekyll and hyde are somehow religious which doesn't make them seem that different after all.
"man is not truly one, but truly two"
i think this one is pretty clear so it doesn't really need an analysis lol
"original evil"
jekyll describes how turning into hyde is unavoidable. this presents that the two characters are strongly connected in jekyll's mind which highlights the duality.
"ordinary secret sinner"
jekyll describes his dark side which links to hyde.
i know this isn't a lot and probably very common but i hope it helped a little anyway.