Help Finding the Source of a Dickens Quote

Hi, I'm wondering if anyone knows the primary source of the following quote by Charles Dickens: “An idea, like a ghost (according to the common notion of ghosts), must be spoken to a little before it will explain itself.” A book from 1875 by Samuel Austin Allibone entitled Prose Quotations from Socrates to Macaulay attributed this quote to Dickens, just as many other books and websites have

Help Finding the Source of a Dickens Quote