What is the origin of saying every cloud has a silver lining?

The phrase "every cloud has a silver lining" suggests that even difficult situations can have positive aspects. Its origin is often attributed to John Milton's 1634 poem "Comus," where he writes about clouds having a "silver lining" that brings hope. Over time, this metaphor has evolved to convey the idea that challenges can lead to beneficial outcomes or lessons. The saying emphasizes optimism even in adversity.