It means that the saddest thing is that people have no thoughts or lose free thoughts, which is more sad than death; Now, the most sorrowful thing is to be dull and insensitive. It is a Chinese idiom, whose phonetic alphabet is i m ò d à y ú x ī n s ǐ, which comes from Zhuangzi Tianzifang: "There is no greater sorrow for a man than death in his heart, and death comes next."
example sentence:
1. We should keep up our spirits and work hard. We should know that grief is greater than death.
2. After digging out my heart and lungs, I finally realized what sorrow is more than death.
3. People say, "Sorrow is no greater than death of heart." The heart is already dead. I should not come to your residence again to disturb you. "