Somewhere or other there must surely be
 The face not seen, the voice not heard,
The heart that not yet--never yet--ah me!
Made answer to my word.
Somewhere or other, may be near or far;
Past land and sea, clean out of sight;
Beyond the wandering moon, beyond the star
This means that her ‘word’ or internal longing produces no response from the ‘face not seen etc.’ 
 Note that the metre —  iambic   tetrameter  or four metrical feet per line — provides a broad framework, but the poet departs from this readily. The fourth line of the stanza, for example, is a  trimeter  or three metrical feet per line. The irregular rhythm is unsettling and suggests the emotional pain of the speaker.
Somewhere or Other