Silver lining (idiom)
Appearance
Look up silver lining in Wiktionary, the free dictionary.
A silver lining is a metaphor for optimism in the common English-language idiom "Every cloud has a silver lining."[2]
Origin
The origin of the phrase is most likely traced to John Milton's "Comus" (1634) with the lines,
Was I deceiv'd, or did a sable cloud
Turn forth her silver lining on the night?[3]