Question

One theme evident in these lines from the passage is fear. Which other theme has the author brought in by depicting a contrast in ideas?
My first emotions had been those of pure melancholy and sincerest pity; but just in proportion as the forlornness of Bartleby grew and grew to my imagination, did that same melancholy merge into fear, that pity into repulsion. So true it is, and so terrible too, that up to a certain point the thought or sight of misery enlists our best affections; but, in certain special cases, beyond that point it does not.
compassion
chaos
death
ignorance