Dickens establishes the friendship between Scrooge and Marley, highlighting their time-honored relationship and likening their characters, reflecting Marley's isolation and suffering onto Scrooge
Marley outlines the structure of the novella by warning Scrooge of the Three Spirits that will visit him, establishing a timeline of events and adding a sense of structure to the chaotic supernatural events Scrooge experiences
Marley's Ghost represents the Christian belief system of heaven and hell, in purgatory due to his own actions during life, suffering as a direct consequence of his attitude towards others
Marley's character serves to introduce religious and supernatural themes, establish religious justice, and act as a deterrent by exemplifying the repercussions Scrooge will face if he fails to change
The relationship between Scrooge and Marley is portrayed as vital, with Marley being dependent on Scrooge, emphasizing the importance of companionship even for miserly individuals
"I wear the chains I forged in life" holds a double meaning, both literal and figurative, reflecting Marley's eternal captivity due to his past actions
"no rest, no peace. Incessant torture of remorse" creates tension and mirrors Marley's trapped feelings in purgatory
"Mankind was my business" reflects Dickens' ideas on social responsibility and the importance of being socially conscious