Original text: (Emperor Taizong) sighed: "Take copper as a mirror, and you can straighten your clothes; Take the past as a mirror, you can know the rise and fall, and take people as a mirror, you can know the gains and losses. I have tried to protect these three lessons, and I have defended myself from the inside. Today, when Wei Zhi dies, it's a lesson in death. I get a book and a piece of paper than sending people to their homes. The knower says,' There are good and evil things in the world, and if you are good, it will be national security, and if you use the wicked, it will be harmful to the country. There is love and hate within the public or the public. Those who hate only see the evil, while those who love only see the good. Between love and hate, you should be careful. If you love and know its evil, hate and know its good, don't doubt the evil, and Ren Xian can be happy. " It is roughly like this. I think about it, and I'm afraid I can't help it. Officials and courtiers can write about it (hù), and if they know it, they will remonstrate.
Tang Taizong sighed and said, "Using copper as a mirror can make you dignified and neat when you wear it; Taking history as a mirror, we can know that since the dynasties, survival has risen and fallen; Take people as mirrors, you can know your own gains and losses. I used to keep these three mirrors to prevent my own mistakes. Now that Wei Zhi is dead, I have lost a mirror. I recently sent someone to his house and found a manuscript, only half of which was written. Those who can understand it are' there are good and bad things in the world. If you hire good people, the country will be stable; if you hire bad people, the country will decline. Between love and hate, we should be careful. If you like to understand the shortcomings, hate to understand the strengths, do not hesitate to remove evil, and appoint talents without suspicion, you can prosper. "The general content of the book is like this. I always think about it for fear of making mistakes. Officials and courtiers can write on the board, and those who know that they can remonstrate must remonstrate. "