Who wrote this poem by the sage in ancient books?

Han Yu. Let me explain the situation first. If you only look at the topic, it is easy to understand that Han Yu believes in Buddhism. In fact, the truth is that Han Yu is basically not religious, which means that neither Sect believes in it. As for being regarded as a saint by Confucianism, it is easier to understand, because he is an out-and-out Confucian scholar and Han Yu is a well-known scholar in the Tang Dynasty, so it is not too much to be named a saint.

First, Han Yu, who opposes Buddhism, can be said to be strongly opposed to Buddhism. He has great courage. He once wrote an article, probably saying that before Buddhism was introduced into the Central Plains, the former monarchs (Yao, Shun, Yu and others) lived for 100 years before they ended their rule peacefully. However, since Buddhism was introduced into China, the average life expectancy of monarchs has been greatly reduced. You know, the wind of believing in Buddhism in the Tang Dynasty just rose. The emperor is also supporting the development of Buddhism. If this is offensive, it is to curse the emperor's short life. If you accuse him of rebellion casually, he will die several times. So later, although Han Yu didn't die, he was demoted again.

Second, I am still against Taoism. Han Yu does not believe in Taoism, and the relationship between Taoism and Han Yu is actually not very good. If Taoism insists on wooing Han Yu, I have to mention Han Xiangzi. Han Xiangzi, the Eight Immortals, is his nephew. Apart from this relationship, Han Yu and Taoism are basically hostile camps, and Han Yu, the founder of Taoism, is still despised. In particular, Lao Zi, the founder of Taoism, was extremely belittled by Han Yu. In short, he was a villain who sat in the well and watched the sky. In this case, it is good that Taoism does not attack him. How can you think of it as wooing him?

Third, the sage of Confucianism Finally, regarding Confucianism, in fact, Han Yu deserves the greatest honor given to him by Confucianism. Let's look at Han Yu's title, the first of the eight masters in Tang and Song Dynasties, an advocate of the ancient prose movement, and a famous writer, thinker and politician in Tang Dynasty. It's really not necessarily who beautified Han Yu with Confucianism.