i closed my eyes , trying to imagine the stage of sao carlos and match callas intense , resonant voice to juliskas innocent face , but instead of juliska i saw nomi the delicate , translucent skin of her hands as she composes in black ink the goodbye letter to alfredo ; her dark eyes tearing up as she solemnly promises germont in the libretto dite alle giovine that she would do what he asks of her and renounce her love .