Sonnet: When I Have Fears That I May Cease To Be

When I have fears that I may cease to be
  Before my pen has glean'd my teeming brain,
  Before high piled books, in charactry,
  Hold like rich garners the full-ripen'd grain;
When I behold, upon the night's starr'd face,
  Huge cloudy symbols of a high romance,
And think that I may never live to trace
  Their shadows, with the magic hand of chance;
And when I feel, fair creature of an hour,
  That I shall never look upon thee more,
Never have relish in the faery power
  Of unreflecting love; -- then on the shore
Of the wide world I stand alone, and think
Till Love and Fame to nothingness do sink.