At this time, Li Bai's economic conditions are relatively good, and he can refine the elixir. Of course, Li Bai has been to Tiantai Mountain many times. He came here at the age of 26. But judging from the choice of words and the desire to cultivate immortality, it is more in line with things after 40 years old.
Judging from the artistic conception of the poem, it is very high. When Li Bai came up, there were four pairs: the roof was adjacent to Siming and the ceiling was high. The red cliff of Chicheng Mountain is like a stone shadow entering Zhumen, and the bright moon of Cangdao is like perching on the top of the mountain. Then there are many proofs: clouds hang down, waves rise, and waves rise. It can be seen that Tiantai Mountain gives Li Bai a good feeling (in this case, it may have been written when he first came to Tiantai Mountain, and it should be dull after going to it many times).