江山易改，禀性难移（江山易改，禀性難移）　

◎ 江山易改，禀性难移 jiāngshān yì gǎi,bǐngxìng nán yí

[It‘s easy to change rivers and mountains but hard to change a person‘s nature;a fox may grow grey,but never good;a sow,when washed,returns to the muck;it is hard to change man‘s natural disposition than to change rivers and mountains] 政体容易更改,本性难于变移,比喻生性风格或既成的事实难以改变