a small vessel is easily filled
It is a Chinese idiom. Pinyin is Xi ǎ OQ ì y ì y í ng, which means that it is easy to be complacent because of its small quantity. It comes from the notes of Prince Wei in Yuancheng.
The origin of Idioms
Wu Zhi of Han Dynasty wrote in the note between the city of Yuan Dynasty and the prince of Wei: "if small utensils are easy to be filled, the first thing is to be settled."
Idiom usage
As an object or attribute; used to admonish
Examples
That is, to be a slave, to be poor all one's life, but not to be a murderer. Always ~, insatiable, such a thing. The drunken awakening stone: The Curse of fake Huwei antiques
a small vessel is easily filled
the buffaloes in jiangsu pant when they see the moon mistaking it for the hot sun - wú niú chuǎn yuè