This quote implies scrooge is a self inflicted loner but also suggests that there's more to him just like an oyster which can be prised open to find a pearl inside.
What does scrooge say to bob when he asks for one day of at Christmas time? You'll want all day tomorrow, I suppose? said scrooge. If quite convenient sir.
(The boy carol singer) THE GHOST OF CHRISTMAS PAST STARTS TO BRING OUT A change in Scrooge as he begins to reflect on his recent behaviour towards others.....