Where did the' show off the ceremony' come from? What do you mean?

Sorry, I don't know much about it either. Do you mind copying other people's answers?

"Show love, stop at ceremony" is the theory of Confucius.

Legend has it that Guan Ju, the first article in the Book of Songs edited by Confucius, describes a young man who can't sleep because he yearns for women. The son of Confucius' students repeatedly said that "it is all a matter of courtesy and righteousness", which Confucius advocated.

"Hu" is a preposition with the same meaning as "Yu"

"Love stops at ceremony" means "Love begins at reason and ends at moral etiquette"

It means that it is ok to fall in love, but you can't go beyond the boundaries of etiquette, that is, you can't have sex. The purpose here is not to stop feelings, but to stop when etiquette allows, and not to do anything beyond etiquette because of love.