The first half of a well-known proverb pair:
若要人不知,除非己莫为 - 'If you want others not to know, then you yourself must not do it.' The saying echoes an earlier formulation in a memorial attributed to the Han scholar Mei Sheng (
枚乘):
欲人勿闻,莫若勿言;欲人勿知,莫若勿为. The popular modern rhyme became proverbial through ballads and vernacular fiction.