Suspiria de Profundis

I talked about the movie "Suspiria" a bit ago, but I wanted to know the origin of such a word, since I have never heard anything like it until I saw Bravo's "100 scariest movie moments".

Suspiria de Profundis

From wiki:

Suspiria de Profundis (a Latin phrase meaning "sighs from the depths") is one of the best-known and most distinctive literary works of the English essayist Thomas De Quincey.
First published in fragmentary form in 1845, the work is a collection of short essays in psychological fantasy — what De Quincey himself called "impassioned prose," and what is now termed prose poetry. The essays of the Suspiria "are among the finest examples of De Quincey's or anyone else's English style."
"Some critics consider De Quincey's Suspiria de Profundis the supreme prose fantasy of English literature." De Quincey conceived of the collection as a sequel to his masterwork, Confessions of an English Opium-Eater (1821). Like that work, the pieces in Suspiria de Profundis are rooted in the visionary experiences of the author's opium addiction; and at their best, the Suspiria capture the same type of dark grandeur found in the Confessions.

The essay "Suspiria":

http://www.readbookonline.net/readOnLine/38290/