be credulous
It's a Chinese idiom. The Pinyin is Ji à NF à ngsh à y à, which means that you believe it rashly when you see a little sign. It's from officialdom.
The origin of Idioms
The 25th chapter of Li Baojia's Officialdom: they are all masters. Hearing the wind is the rain, the Emperor allowed him to hear about the music, but they were wrong.
Idiom usage
It has a derogatory meaning. Hong Fang's "secretary general" said: "these people move their crutches and see the wind is the rain. If they are re elected huaihang, they have to respect him by three points."
be credulous
One's worth may be one's own ruin - shān mù zì kòu