come out of the mud unsoiled; emerge unstained from the filth ❍ 在这样腐败的环境里，他能够～，仍然廉洁奉公，真是难能可贵啊！ In such a depraved environment he can come out of the mud unsoiled and remain honest in performing his duty.This is truely estimable!
出污泥而不染chu wu ni er bu ran
emerge unsullied from the filth remain undefiled in spite of general corruptions