Clouds and eclipses stain both moon and sun,
And loathsome canker lives in sweetest bud.
(Sonnet 35.)
In an opposite sense is Sonnet 70:
The ornament of beauty is suspect
A crow that flies in heaven's sweetest air,
For canker vice the sweetest buds did love,
And thou presentest a pure unstained prime.
Sonnet 7 has:
Lo! in the orient when the gracious light