江山易改，禀性难移
[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
同“ 江山易改，本性难移 ”。 明 《杀狗记·谏兄触怒》：“他纵无怨恨之心，奈絶无顺从之美，正所谓江山易改，禀性难移。”《醒世恒言·徐老仆义愤成家》：“常言道得好：‘江山易改，禀性难移。’”