It is believed to have originated from a Buddhist sutra, the <a href="https://en.wikipedia.org/wiki/Mah%C4%81y%C4%81na_Mah%C4%81parinirv%C4%81%E1%B9%87a_S%C5%ABtra" rel="noopener noreferrer" target="_blank">Mahayana Mahaparinirvana Sutra</a> 《大般涅槃经》, donated to us by the content team over at Du Chinese. A challenge for HSK 2, should be smoother for HSK 3.