This sentence comes from Zhu Zi's Family Instructions written by Zhu Bailu in the late Ming and early Qing Dynasties. People should not be happy when they are in trouble. Being a good person and wanting to be seen by others is not really good; Fear of being known is a great sin.
Don't be jealous of other people's festive events. Don't gloat when others are in trouble. If you do a good thing and want others to see it, then you are not really a good person. If you do something bad and you are afraid that others will know, then you are really wicked.
Extended data:
"Family Instructions of Zhu Zi" is only 524 words, which brilliantly expounds the ways of self-cultivation and family management, and is a masterpiece of family education. Many of these contents have inherited the excellent characteristics of China traditional culture, such as respecting teachers and valuing morality, being diligent in housekeeping, and having a harmonious neighborhood, which have been highly praised by Confucian scholars in past dynasties and still have practical significance.
The word "fertile land" in the book shows that Zhu lived in the suburbs at that time. Now that Zhu Zi's home has been demolished, is the suburb urbanized or urbanized? Zhu Xi's home has been lost in the long river of history by high-rise buildings, but Zhu Xi's family instructions have been preserved.