What is the question discussed in the third paragraph of Preface to Lanting Collection? What does the author's argument have to do with the previous paragraph?

The preface to Lanting Collection summarizes the problems discussed in the second paragraph with the original sentence of the text, and then discusses what the discussion has to do with the previous narrative.

Answer: The first question: "Life and death". The second question: The first narrative is about the "happiness" in the relationship between people, which leads to the discussion in this paragraph, from "taking pleasure in meeting it" to "meeting it with emotion", to "being short and appropriate, and ending it", and finally comes down to "being born after death is also great".

The second and third paragraphs of Preface to Lanting Collection turn from happiness to sadness, expressing the author's feeling that life events caused by Preface to Lanting Collection are infrequent and fleeting.