Sentence:  They often murmur to themselves, they speak/ To one another seldom, for their woe/ Broods maddening inwardly and scorns to wreak/ Itself abroad; and if at whiles it grow/ To frenzy which must rave, none heeds the clamour,/ Unless there waits some victim of like <WSD>glamour</WSD>,/ To rave in turn, who lends attentive show. 
Meaning of the word marked with <WSD> tags:  Witchcraft; magic charm; a spell affecting the eye, making objects appear different from what they really are.