The Shawl by Louise Edrich
“But we still have sorrows that are passed to us from early generations, sorrows to handle in addition to our own and cruelties lodged where we cannot forget them. We have the need to forget. We are always walking on oblivion edge”
Oblivion: the state of being forgotten, especially by the public
As a Native American, the character/narrator in this passage is a part of American history that is not spoken about very often and even then is expressed in very vague and incomplete ways. His entire culture and his people are on the verge of extinction and they are very much like living ghost.