quote analysis + technique: metaphor 2
->"manacles" are associated with slavery & lack of freedom/imprisonment - which shows people are enslaved by authorities but also their own mindset & fear/also enslaved by accepting injustice & not doing anything about it
-> Blake is also implying it is their fears & aversions that prevent change within London's society, as they are physically free(manacles are metaphorical) but enslaved by concepts instead