The origin of "the tide came from Qiantang River, and now I know that I am myself" in the Water Margin.

This sentence comes from the water margin, the third time, Shi Dalang traveled in Huayin County at night, and Lu Tihai Boxing Town was in Kansai. It is a poem sung by Lu Shen Zhi (Lu Da) after he became a monk in Wutai Mountain.

This poem means that when the tide letter came, he realized that he was not himself. Through this sentence, Lu expressed his epiphany, admitted his mistakes and shortcomings, and was determined to change himself.

It is worth noting that the source of this sentence is the novel Water Margin, not a real historical event or person.