Meaning of 哀莫大于心死

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āi xīn (Trad.: 哀莫大於心死)
nothing sadder than a withered heart (idiom attributed to Confucius by Zhuangzi 庄子 ); 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