What do you mean, rotten wood can't be carved? The origin of idioms and the explanation of detailed words

The phonetic notation is the Chinese phonetic alphabet kūmùshěHuā, which is synonymous with dead trees, flowers, dead trees and flowers. Metaphor is a kind of salvation. This is also a metaphor for the impossible. (1) is a metaphor for regaining vitality in a desperate situation. Ming Shen shou xian San yuan Ji 17: "my life is like a drop of grass, and today I get this money, like a dead tree growing flowers, spreading in spring." (2) Metaphorically, things are difficult and difficult to achieve. Zen master Kuang Ren of Shushan: "If you want to know this, you have to be like a dead tree growing flowers before you can join him. My life is like a drop of grass, and I got the money today, just like a dead tree blossoming. Similar words in Ming and Shen Shousan's Three-element Pen: Dead Trees Meet Spring.