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During the Spring and Autumn period, Duke Gong Bo of Wei and his wife, Jiang, were deeply in love. They had made a solemn vow that their love would remain unchanged until death.
Later, after Duke Gong Bo passed away, his parents wished for his wife, Jiang, to remarry.
However, Jiang resolutely refused. She composed a poem called 'Cypress Boat' to demonstrate their steadfast and unwavering love, persuading her parents-in-law to give up the idea of her remarriage.

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Open the tool →匪石之心 (fěi shí zhī xīn) is a Chinese idiom (chengyu) meaning “Unwavering loyalty, steadfastness, or resolute faithfulness”.
匪石之心 is pronounced fěi shí zhī xīn in Mandarin Chinese.
Literally, 匪石之心 means “Heart not of stone”. It is used to mean “Unwavering loyalty, steadfastness, or resolute faithfulness”.
匪石之心 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
比喻坚贞不渝。