beware of the harm done by small things
It is a Chinese idiom. Pinyin is f à ngch à iy à UD ú, which means to describe some characters whose status is low but can harm others. It comes from Zuo Zhuan, the 22nd year of Duke Fu.
The origin of Idioms
Zuo Zhuan, the 22nd year of the Duke of Fu, said, "you are meaningless. You are small, but you are poisonous. What about the state?"
Idiom usage
Wen Qing was a little impatient here. When she was about to have an attack, she was afraid that the bee might be poisonous and cause trouble, so she had to take her head and swallow it. The 24th chapter of Zeng Pu's Nie Hai Hua in Qing Dynasty
Chinese PinYin : fēng chài yǒu dú
beware of the harm done by small things
stamp one 's feet and beat one 's breast. dùn zú zhuī xiōng
the sea and sky are boundless. hǎi kuò tiān gāo
advantageous to both public and private interest. gōng sī liǎng biàn
display of fireworks and a sea of lanterns. huǒ shù yín huā
When enemies meet, they are very jealous. chóu rén jiàn miàn ,fèn wài yǎn hóng
leaving evil unchecked spells ruin. yǎng yōng chéng huàn
Take the snow and fill the river. dān xuě tián hé