Fragment: 'Is It That in Some Brighter Sphere'

Published by Dr. Garnett, "Relics of Shelley", 1862.

Is it that in some brighter sphere
We part from friends we meet with here?
Or do we see the Future pass
Over the Present's dusky glass?
Or what is that that makes us seem 
To patch up fragments of a dream,
Part of which comes true, and part
Beats and trembles in the heart?