Orign of 'In every life, some rain must fall'?

English as a Second Language English Teacher Explanations (ESL Tests)
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English Language Proficiency Tests, Advanced Level

ESL/EFL Test #524 [color=blue]“English Slang Idioms (108)”, question 1

She lived a pleasant, privileged, carefree life up until now. However, she recently lost her job and that, in turn, made her mortgage payment overdue. The bank was threatening to take her house. She remembered that her mother told her once “In every life, some … must fall” – she hadn’t fully believed it until now.

(a) people
(b) houses
(c) rain
(d) stock

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #524 [color=blue]“English Slang Idioms (108)”, answer 1

She lived a pleasant, privileged, carefree life up until now. However, she recently lost her job and that, in turn, made her mortgage payment overdue. The bank was threatening to take her house. She remembered that her mother told her once “In every life, some rain must fall” – she hadn’t fully believed it until now.

Correct answer: (c) rain
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Would you like to give here the origin of the phrase “In every life, some rain must fall”, please? What is the source of it?

Thank you,
Vladimir.

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The Rainy Day

THE day is cold, and dark, and dreary;
It rains,and the wind is never weary;
The vine still clings to the mouldering wall,
But at every gust the dead leaves fall,
And the day is dark and dreary.

My life is cold, and dark, and dreary;
It rains,and the wind is never weary;
My thoughts still cling to the mouldering past,
But the hopes of youth fall thick in the blast,
And the days are dark and dreary.

Be still, sad heart, and cease repining;
Behind the clouds is the sun still shining;
Thy fate is the common fate of all,
Into each life some rain must fall,
Some days must be dark and dreary.

~Henry Wadsworth Longfellow

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Oh, the phrase is from the poetry!!!
That’s quite unexpectedly!

Thanks, Beeesneees!