Isolation is the main theme of the story, as Bartleby chooses to isolate himself from his coworkers and employer. He decides to leave work aside and do nothing.
<h2><em>So</em><em> </em><em>That</em><em> </em><em>-</em><em> </em><em>I</em><em>t</em><em> </em><em>tells us for what purpose something is done</em></h2>