too profound to be understood
As a Chinese idiom, Pinyin is m ò C è g ā OSH ē n, which means that the degree of sophistication can not be speculated. It refers to the attitude of life, or the content of speech or article (mostly not in the positive, with a derogatory meaning). It comes from the biography of Yan Yannian in Hanshu.
The origin of Idioms
"Yan Yannian biography of the Han Dynasty:" the officials and the people can not measure the depth of its meaning
Idiom usage
The verb object type is used as predicate and attributive with derogatory meaning. Of course, the county magistrate has something we can't find. Lu Xun's Hua Gai Ji: this and that
too profound to be understood
narrate anecdotes of the past in alluding to the present - yǐn gǔ yù jīn
high walls and deep moat -- a defended city - gāo chéng shēn chí