Old diseases are hard to cure
It is a Chinese idiom. The Pinyin is Ji ù B ì NGN á NY ī, which means that it is difficult to correct the past mistakes. From Handan, Sanhua.
The origin of Idioms
The third part of Ming Dynasty's Wu Mingshi's "Sanhua Handan" is: "you can't find an escape plan when you are a prisoner holding an official. You can't turn back quickly until you regret coming late, and you don't tie up your heart and mind. It's not that your nature can't be changed and your old illness can't be cured."
Idiom usage
Used as an object or attribute
Old diseases are hard to cure
fluctuate in line with market conditions - suí háng jiù shì
follow or obey with sincere willingness - shū xīn fú yì