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Grandfather belongs to the research category of folklore, and is generally called the founder of academic schools, religious factions and all walks of life, or a person who has made great contributions to the formation of an industry. Representative figures include Du Kang and Lu Ban.

Industry ancestor worship is a branch of folk culture. In the past, all walks of life attached great importance to it and regarded it as the patron saint of this industry. There is a folk saying that "three hundred and sixty lines, no ancestors can stand."

Grandfathers are very prestigious people, who directly or indirectly created and supported this industry. Some people became ancestors by accident, others were forcibly installed by later generations, and some industries used a founder, such as pawnshop, fortune telling, candle industry, sericulture industry, silk weaving industry and pastry industry, all of which took Guan Yu as their founder.

Some people have several grandfathers in the same industry, such as Guan Zhong, Chi You, Zhang Fei, Yan Di and Lu Ban in the salt industry.

Gratitude is to repay others with a sincere heart. It is the reward you give after others give you some help. It is a kind of debt psychology that you gave your help to someone who has nothing to do or is not close enough. It is a philosophy of life and great wisdom of life.

A wise man should not haggle over what he doesn't have, nor should he blindly ask for it to inflate his selfish desires. Learn to be grateful for what you have and what life has given you, so that you can have a positive outlook on life and a healthy attitude.