You can't just correct your mistakes and think you can get something. In fact, there is no right or wrong, it will change with the change of history (time) and situation. We should look at the problem dialectically and objectively, look at the problem from the perspective of development, and analyze the specific problems in detail. This is Marx's thought.

Ye Shi, a great thinker in the Southern Song Dynasty, wrote so sadly in The General Theory of Statutes II:

The reason why the ancients won the world is that they must win it; If it loses the world, it loses. There is no distinction between gains and losses, so it is not wrong. What is this? The cover must be true, and it is not necessary to correct it; If you correct your thoughts, you will lose them. Tang, Yu and three generations all have the law of mutual cause, and the merits of Yu and Tang will not be wasted because of the chaos of Jie and Zhou; Although Han destroyed Qin, it was mostly because of the old Qin. But on the whole, the politics of the world is getting finer and finer, while the law and Japan are encrypted; However, he still has the intention of serving the country for himself, not punishing the mistakes of his predecessors, but doing the opposite and thinking that he is meritorious.

In 907, the Tang Dynasty, the most brilliant world empire in China's history, perished. In 960, just 53 years later, the Song Dynasty was founded. From then on to 1840, a new millennium began.

In a word, the founding of the Song Dynasty was to "correct the mistakes of the Tang Dynasty", and its basic system design was based on the "discipline" of "correcting the lost". Therefore, it is almost inevitable for the Song Dynasty that the glorious Sui and Tang Dynasties left only eight years of "An Shi Rebellion" in 326 years, and there is probably only one thing that the rulers of past dynasties have been obsessed with for more than 300 years: drawing profound historical lessons from the "An Shi Rebellion".