Men's courage comes from Mencius Hui Liang Wang Xia: "This man's courage is also an enemy."

During the Spring and Autumn Period, Gou Jian, the king of Yue, was defeated and taken to Wu by Fu Cha, the king of Wu. He was imprisoned for three years and was humiliated. Later, when Gou Jian returned to China, he was determined to retaliate against Wu.

Gou Jian clearly knows that without the support of the people, a powerful country cannot be established, and revenge is just empty talk. Therefore, he adopted a series of policies to recuperate in Yue State, and did not levy civil tax for ten years, which made the people rich and the country strong.

Because many people died in the war, the population of Vietnam has been greatly reduced. Gou Jian also ordered giving birth rewards to encourage population growth and welcomed people from other countries to move to Vietnam. After more than ten years, the population of Vietnam has increased rapidly.

In this way, after many years, the state of Yue became rich and strong, and its soldiers were stronger than Ma Zhuang and Enemy at the Gates, and they appealed to Gou Jian to crusade against Wu. Gou Jian agreed and made a speech to the soldiers before going out to war: "I heard that the ancient sages were not worried about the shortage of soldiers, but worried about the lack of self-improvement spirit of soldiers." I hope you use wisdom to defeat the enemy, not courage! I hope you can keep pace, unite against the enemy, advance and retreat together, and never stop until you defeat the enemy! "

Soldiers have high morale and encourage each other. Everyone is willing to serve the country and the monarch. So Gou Jian led an army to attack Wu, and Fu Cha, the king of Wu, was defeated, and Wu was finally destroyed by Yue.

Later, people used the idiom "People are brave" to describe a person who is brave but has no wisdom.