From Sima Qian's 《报任少卿书》 (Han dynasty): 'everyone must die, but some deaths are weightier than Mount Tai, others lighter than a feather (或重于泰山，或轻于鸿毛).' Pair it with its antonym 轻于鸿毛 to preserve the original contrast.
culture
Mount Tai (泰山) is the foremost of the Five Sacred Mountains, long used in Chinese writing as the archetype of immovable weight and importance.
