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
trad. 哀莫大於心死
Also written 哀莫大於心死【āi mò dà yú xīn sǐ】