The boat is better than the monarch, and the water is better than Li Shu. The knife cuts bread and fingers. It turns out that this is Wei Zhi's "coachable", and Tang Taizong and Li Shimin often warned later generations, which has already become Li Shimin's "famous saying". The meaning of this sentence is straightforward, that is, regard a regime as a "ship" and the people as "water". The meaning of "water can carry a boat, but it can also overturn it" is roughly equivalent to "those who win the hearts of the people win the world, and those who lose the hearts of the people lose the world." He also warned the minister to remind himself to be diligent in government affairs, not to neglect, to be prepared for danger in times of peace, and to observe the people's feelings, otherwise he would repeat the mistakes of the previous dynasty.