江山易改禀性难移

jiāng shān yì gǎi bǐng xìng nán yí

rivers and mountains are easy to change, man's character much harder

jiāng

(bound form) Yangtze River

shān

mountain; hill (CL:座[zuo4])

abbr. for 易經|易经[Yi4 jing1], the Book of Changes

gǎi

to change

bǐng

to make a report (to a superior)

xìng

nature

nán

difficult (to...)

to move