Every cloud has a silver lining

Proverbial Meaning: When something bad happens there is always some good that comes of it.

Literal Origins: While storm clouds are dark underneath, the sun shines above them and they are lighter on top.

Common Usage: This proverb is probably in the top ten most used proverbs of all time and is still in very common use. It is also the main theme of many popular movies.

See also: Always look at the bright side