Omit quotation marks at the beginning, and end of the quoted passage; the indented margin ( and the introductory citation) will tell your readers that you are quoting.
Here is an example:
Although he worked "hard as hell" all winter, Fitzgerald hald difficulty finishing
The Great Gatsby. On April 10, 1924, he wrote to Maxwell Perkins, his editor at Scribner's:
While I have every hope & Plan of finishing, my novel in June ... even [if] it takes me 10 times that long, I cannot let it go unless it has the very best I'm capable of in it or even as I feel sometimes better than I'm capable of. It is only in the last four months that I've realized how much I've-- well, almost deteriorated.. What I'm trying to
say is just that .... at last, or at least for the first time in years, I'm doing the best I can.