Eleanor Farjeon

Double Beauty

Love of the light compels the lark to sing
  And brims his tiny body with a spark;
The nightingale draws music from a spring
  Out of the bosom of the belovèd dark;
But on man's twofold nature God has breathed
  The double soul of beauty like a spell,
And dark in light or light in darkness sheathed
  His spirit still must sing the miracle.