Quote
Into each life some rain must fall, some days must be dark and dreary.
Note
Longfellow acknowledges that difficulty and sorrow are inevitable parts of life. "Rain" and "dark days" are metaphors for hardship. This is an internal standard in the sense that accepting this reality can bring calm: instead of demanding perpetual sunshine, we recognize that struggle is universal and temporary. The poem's conclusion (not quoted here) offers hope—storms pass. This line prepares us emotionally for life's inevitable difficulties without despair.