as the arm directing the fingers -- command with ease as one wishes
It's a Chinese idiom. Pinyin is sh ǐ B ì sh ǐ zh ǐ, which means to command freely like using one's own arms and fingers. It's from Guanzi light and heavy B.
The origin of Idioms
"Guanzi, light and heavy B": "if this is the case, it is like using the arm in the chest and the finger in the arm."
Idiom usage
It can be used as predicate and object. In the biography of Jia Yi in the history of Han Dynasty, it is said that "if you command the power of the sea, you must obey it."
Chinese PinYin : shǐ bì shǐ zhǐ
as the arm directing the fingers -- command with ease as one wishes
one 's temper and nature are in accord with someone. yì qì xiāng tóu
out of the depth of misfortune comes bliss. pǐ jí tài lái
take a heavy burden and embark on a long road. rèn zhòng dào yuǎn