āi mò dà yú xīn sǐ
nothing sadder than a withered heart (idiom attributed to Confucius by Zhuangzi 莊子|庄子[Zhuang1 zi3])
no greater sorrow than a heart that never rejoices
the worst sorrow is not as bad as an uncaring heart
nothing is more wretched than apathy
ài mò dà yú xīn sǐ
nothing more sad than a withered heart
no greater sorrow than a heart that never rejoices
(popular culture misquotation of 哀莫大於心死|哀莫大于心死, saying attributed to Confucius by Zhuangzi 莊子|庄子)
guò ér néng gǎi , shàn mò dà yān
If one can change after making a mistake, there is nothing better (idiom)