Introduction to the flow of water to the west of this group: According to the biography of Thich Nhat Hanh in Volume 191 of the "Old Book of Tang", he was ordered to compile a new almanac "Dayan Calendar" to replace the old calendar, and traveled thousands of miles to Guoqing Temple Ask a teacher for advice on astronomy and mathematics. At that time, the eminent monk Dazhen predicted that the group was coming, and said, "Now the water in front of the door is flowing to the west, and it is time for the disciples to arrive." It turns out that when heavy rain fell, the water in the stream surged and flowed back to the west stream, hence this saying. Later generations erected a monument beside Fengqian Bridge to commemorate it.