What is the next sentence that can judge a book by its cover?

It means: you can know your daily gains and losses by looking at others as a mirror.

Source: "Old Tang Book Wei Zhi Biography" Li Shimin: Fu can dress with copper as a mirror; Taking history as a mirror, we can know the rise and fall; Take people as a mirror, you can know the gains and losses. I have kept these three mirrors in case I pass by. Now Wei Zhi is dead, he died in a mirror!

Using copper as a mirror can tidy up a person's clothes; Taking history as a mirror, we can know the ups and downs in history; Taking others as a mirror, you can know your daily gains and losses.

There is a popular joke: the farmer caught a pig, and the pig shouted and struggled desperately. Sheep and cows don't like it, criticizing pigs, saying that we are often caught, unlike you. The pig replied, all they have to do is cut your hair and milk you, but they want to eat my meat.

The moral of this story is obvious. Sheep and cows can't think from the standpoint of pigs, so they can never understand the suffering of pigs. Therefore, if we want to understand others, we must learn to put ourselves in others' shoes. If you can put yourself in others' shoes, you can be sympathetic and tolerant.

Extended data:

When Emperor Taizong made some mistakes, Wei Zhi often confessed to him. He often reminded Emperor Taizong that "water can carry a boat, but it can also overturn it". People can support you and achieve you. When you don't cherish the people, they can overthrow you. Therefore, Emperor Taizong always governed the country with trepidation. Wei Zhi once protested fiercely, which made Emperor Taizong angry.

Emperor Taizong angrily ran back to his bedroom and shouted as he walked, "You must kill this Tian She Weng!" When the eldest grandson saw that he was furious, she thought to herself-who could make the emperor so angry that he didn't behead him immediately? Only Wei Zhi can do it.

So the eldest grandson put on a set of dignified and gorgeous clothes, walked up to Emperor Taizong, knelt down and sincerely congratulated him: Congratulations to the emperor! Congratulations, Emperor! Emperor Taizong was half dead with anger. He was puzzled to see his eldest grandson's behavior. The eldest grandson said, Your Majesty, courtiers dare to speak out only when a wise Lord appears.

Hearing this, Taizong turned his anger into joy: I see, I know the Lord's ears! Therefore, a wife can have a great influence on her husband. If the queen makes a few slanders at this time, the "chastity rule" may have to be rewritten.

Baidu Encyclopedia-taking people as a mirror can reveal gains and losses.