Every cloud has a silver lining
Definition 1 of 1
Pro Tip 1/3Optimism Emphasized
The phrase suggests a positive outlook during tough times by identifying a hopeful aspect. 
He may have broken his leg, but every cloud has a silver lining – he'll finally have time to write his book.
Pro Tip 2/3Hidden Benefits
The 'silver lining' represents unexpected advantages that can emerge from negative events. 
The trip was cancelled, but every cloud has a silver lining; I saved money for future plans.
Pro Tip 3/3Idiomatic Usage
This phrase is used metaphorically, not to be taken literally about clouds and weather. 
After the storm damaged his garden, Bob said, 'Every cloud has a silver lining,' knowing he could now redesign it.