Water can carry a boat, but it can also overturn it." Originally Wei Zheng's "remonstration" words, Tang Taizong Li Shimin often warned future generations, and over time it became Li Shimin's "famous saying". The meaning of this sentence is very straightforward Bai means that a political power is regarded as a "boat" and the people are "water". The meaning of "water can carry a boat but also capsize it" is roughly equivalent to "those who win the hearts of the people will win the world, and those who lose the hearts of the people will lose the world." The admonishment to the ministers is also to remind themselves that they must be diligent in government affairs, not be neglected, be prepared for danger in times of peace, and be aware of the people's sentiments. Otherwise, they will repeat the mistakes of the previous dynasties that destroyed them.