重於泰山，輕於鴻毛 [－于－－－轻于鸿－]

Jyutping zung6 jyu1 taai3 saan1 ， hing1 jyu1 hung4 mou4
Pinyin zhòng yú tài shān ， qīng yú hóng máo

Definitions (Wiktionary)
  1. phrase, idiomatic
    more weighty than Mount Tai, (while others are) lighter (and less significant) than a wild goose feather.