Divide the origin of deliberation into two paragraphs and summarize the meaning

Divide the origin of deliberation into two paragraphs and summarize the meaning

Once, Jia Dao was thinking about a poem while riding a donkey, but he couldn't make up his mind in one place. He thought that the word "push" in the second sentence should be replaced by "knock". But he thought that "knock" was a little inappropriate, not as good as "push". Whether it was "knock" or "push" was better