Zuo Si, a writer in the Western Jin Dynasty, read Zhang Heng's Fu for Two Cities when he was a teenager, and was deeply inspired. He is determined to write Sandu Fu in the future. Lu Ji couldn't help clapping his hands and laughing, saying that it was a joke for a vulgar person like Zuo Si to want to write such a masterpiece. Even if it is painstakingly written, it must be worthless and only suitable for making jars. Faced with such humiliation, Zuo Si made up his mind. He heard that Zhang Zai, a writer, had been to Min and Qiong (present-day Sichuan), so he visited for advice many times to get familiar with the local mountains, rivers, products and customs. He visited extensively and collected a lot of materials, and then devoted himself to writing. There are papers and pens everywhere in his room, beside the fence and in the toilet. As long as he thinks of good words, he records them and revises them repeatedly. Zuo Si worked hard for ten years and finally finished Sandu Fu. Lu Ji was surprised and admired, so he had to give up.

Analysis: Look for the goal of action, not be moved by outsiders, persistence is victory, and persistence is everything.