In the early Tang Dynasty, the rulers were first afraid of the people. The Tang Dynasty was established on the basis of the demise of the Sui Dynasty. They witnessed the whole process of the demise of the Sui Dynasty and personally felt the great power of the peasant uprising at the end of the Sui Dynasty. Emperor Taizong often organized ministers to discuss the reasons for the demise of the Sui Dynasty. He was good at coachable, and to a great extent, he learned the lessons from the demise of the Sui Dynasty. Emperor Taizong had prepared to build a palace. Minister Zhang thought that the base was built at the beginning of the Sui Dynasty, and completed this work, which disintegrated the Sui Dynasty and remonstrated with each other, making Emperor Taizong very fierce. "The monarch is also a ship, and Shu Ren is also water. Water can carry a boat or overturn it. " This is a famous saying of Xunzi. Because Emperor Taizong experienced the change of capsizing in the Sui Dynasty, water can carry a boat and capsize it, which became the mantra of Emperor Taizong. Many people mistakenly think that this is a famous saying of Emperor Taizong and forget Xunzi's "copyright ownership". (In fact, Xunzi also quoted from Biography, not the original copyright owner. However, it is this awe of the people that forces him to attach importance to "the people are the foundation of the country."