人心惟危

Explanation: But: is; danger: dangerous. The heart of that person's appetite is dangerous. 　　Usage: The main predicate; as predicate; containing derogatory 　　Source: "Book of Yu the Great Desert": "Renxinweiwei, said the heart but minimal, but fine only, Yun-chih Juezhong." 　　Examples: Later, he was for me "~" said the suspected reduced. (Lu Xun, "South chamber to mobilize in order to forget the memory of the North")