Henry Edward Krehbiel,
Studies in the Wagnerian Drama
“ The love of Tristan and Isolde presents itself to Wagner as ceaseless struggle and endless contradiction, and for such a problem there is but one solution—total oblivion. Nirvana is the only conception which offers a happy outcome to such love; it means quietude and identity.The duet is rudely interrupted in its moment of supremest ecstasy by a warning cry from Brangäne. Kurwenal dashes in with a sword and a shout: "Save thyself, Tristan!" King Marke, Melot, and courtiers at his heels. Day, the symbol of all that is fatal to their love, has dawned. ”
