This is what Duxian said. . .

They discussed that people want to live forever, just like debts that cannot be repaid. Duxian believes that some people can be happy because of "immortality", while some people can be happy because of "seeing death as home". Then there is this sentence "An iron ox has an iron heart, and an ox has an iron face."

According to my little knowledge, this means something like "happy pig, painful Socrates" "; The happiness of pigs and Socrates is the same, but the reasons for their happiness are completely opposite. One is satisfied with life, the other is satisfied with the meaning of life.

In this sentence, "face" and "heart" refer to "appearance" and "essence"

"Iron cow" and "ox iron" are the abstract words of "pig" and "pig". "Socrates", that's about it, has no real meaning

It's really confusing