Whose poem "The Qiantang River is at high tide, and you know who I am today"? What does this mean?

This sentence was written sitting in front of the Sixth Hall in Hangzhou. It means that I have never planted good fruit on weekdays, but I only like killing people and setting fires. I heard a letter from Qiantang River today, and I had an epiphany here and now. I don't know who I am. The whole sentence is, I don't fix things on weekdays, I just like killing and setting fires. I suddenly opened the golden rope and broke the jade lock here. I didn't know I was me until today.

Extended data:

In Liuhe Temple in Hangzhou. In the evening, when Lu heard the tide letter from Qiantang River, he suddenly remembered four words given to him by the elder Zhizhen of Wutai Mountain: "Catch in summer and pay close attention to prevent wax." Listen to the tide, but be silent when you see the letter. "I had an epiphany in my heart, so I bathed and changed clothes and died of nirvana. Leave a ribbon:

I don't cultivate good fruits all my life, but I only love killing and setting fires. Abruptly open the golden rope and break the jade lock here. Hey! The letter came from Qiantang River, and I didn't know I was me until today.

Later, the master of Jingshan Society commented on Lu: Lu, Lu! Get up from the green forest. Two arson eyes and a murderous heart. Suddenly, I drifted home, and there was nowhere to be found. Duh! Solution makes the sky full of white jade, which can turn the earth into gold.