a settled practice is hard to reform
Chinese idiom, Pinyin J ī x í n á ng ǎ I, means that old habits formed for a long time are hard to change. It comes from Ba Jin's on one's own creation - preface.
The origin of Idioms
Ba Jin's "on my own creation · preface": "it's really hard to change my habits. When I take up my pen, it's like turning on the tap and the water is flowing continuously."
Idiom usage
I don't believe that it's hard to change old habits. The key is to find a way to change them.
a settled practice is hard to reform
a fast job done by a straightforward person - kuài rén kuài xìng
all blend into one harmonious whole - hún rán yī tǐ
be cast aside like the fan in autumn - qiū shàn jiàn juān
be ready to realize one 's aspiration anywhere all over the country - sì fāng zhī zhì
the man through whose hands passing large sums of money - guò lù cái shén