The two lines of the motto here are not from William Chamberlayne's Pharonnida (1659) — all Poe's texts, as well as Harrison, and Mabbott, I, 319-320, misspell the title of the poem — but are perhaps a confused echo of a passage from a play by the same author, Love's Victory (1658), V, 2746f.: “Conscience waits on me like the frighting shades / Of ghosts when gastly [sic] messengers of death,” etc. S. W. Singer had brought out an edition of Chamberlayne's two works in three volumes in 1820. See Kenneth S. Rothwell in Modern Language Notes, April 1959