walk in the dark and touch blindly
It is a Chinese idiom. Pinyin is m í NGX í NGM á ngsu ǒ, which means to work under unknown circumstances. It comes from FA Yan · self cultivation.
The idiom comes from Yang Xiong's "Fa Yan · self cultivation" in Han Dynasty: "if you ask for something, you just do it in the dark."
walk in the dark and touch blindly
change from arrogance to humility - qián jù hòu bēi
a deep grievance that cannot be cleared - chén yuān mò xuě
like the palm of one 's own hand - làn rú zhǐ zhǎng