tis some visitor i muttered tapping at my chamber door only this and nothing more
darkness there and nothing more.... is that you sweet Lenore?
open here i flung the shutter when with many a flirt a flutterIn there stepped a stately raven of the saintly days of yore; Not the least obeisansce made her not a minute stopped or stayed he; but with mien of lord or lady perched above my chamber door
Be that word our sign of parting bird or fiend I shrieked upstarting get thee back into the tempest and the nights plutonian storequit the bust above my door
and the raven, never flitting still is sitting on the palid bust of pallas just above my chamber door and his eyes have all the demon's that is dreaming And my soul from out that shadow that lies floating on the floor shall be lifted Nevermore!!!
I think the raven is a sign of grief, and it represents how he feels about losing his wife Lenore. The raven also never leaves, which could mean he feels as if the emptiness of losing his wife could also never leave