let those who can serve as teachers
As a Chinese idiom, Pinyin is n é ngzh ě w é ISH ī, which means that those who know how to learn can be teachers, that is, those who know how to learn can learn from others. It's from the book of rites.
The origin of Idioms
In the book of rites, Xueji: "be able to understand, and then be a teacher."
Idiom usage
To be modest is to be modest. Lao Wen, just talk. Those who are good at it are teachers. The seventh chapter of Chi Li's cholera
let those who can serve as teachers