[...]

Volverán del amor en tus oídos

las palabras ardientes a sonar;

tu corazón, de su profundo sueño

tal vez despertará;

pero mudo y absorto y de rodillas

como se adora a Dios ante su altar,

como yo te he querido... desengáñate,

¡así no te querrán!

[...]

Ardent words of love will return

to sound in your ear,

your heart will perhaps awaken

from its deep slumber.

But mute and entranced and kneeling,

like worshiping God at an altar,

like I desired you..., don't kid yourself,

no one will desire you like that!

Todo el poema - The whole poem:

http://www.learn-spanish-online.de/exercises/level3_listen_comprehension/poems/volveran_las_oscuras_golondrinas/3_3_3_becquer_volveran_las_oscuras_golondrinas.htm