On one occasion, Jia Dao rode a donkey into the official road. He is pondering a poem entitled "Li Ning's Seclusion", which reads:
Isolated, with few neighbors,
The meadow extends to the desert garden.
The bird stayed in the tree by the pool.
The monk pushed the moon down the door.
Bridge color separation,
Move stones and move cloud roots.
Come back here for a while,
You don't keep your word.
But he can't make up his mind on one thing, that is, he thinks that the word "push" in the second sentence of "birds stay in the trees by the pool, and monks push the moon down the door" should be replaced by "knock". But he also thinks that "knocking" is a bit inappropriate, so it is better to "push". I don't know whether to "knock" or "push". I'm thinking and chanting. Unconsciously, I rode a donkey into the honor guard of Han Yu (one of the eight masters in Tang and Song Dynasties).
Han Yu asked Jia Dao why he broke into his honor guard. Jia Dao read the poem he wrote to Han Yu, but he couldn't make up his mind whether to say it again with "push" or "knock". Hearing this, Han Yu said to Jia Dao, "I think it's better to knock. Even in the dead of night, knocking at the door when visiting friends shows that you are a polite person! In addition, the word "knock" adds a little more noise in the dead of night. Moreover, it reads louder. " Jia Dao nodded in praise. Not only did he not get punished this time, but he also made friends with Han Yu.
Since then, deliberation has become a popular word, which means to ponder and consider repeatedly when doing an article or a thing.