1. Before Yuan Shao launched Guandu War against Cao Cao, Tian Feng, an adviser, advised him not to go south, but to consume Cao Cao by guerrilla warfare and protracted war. Yuan Shao didn't listen, put Tian Feng in prison, and announced that Tian Feng was executed after his triumphant return. However, the war in Yuan Jun was defeated again and again. Yuan Shao listened to the rumor of the villain, thinking that this was Tian Feng's previous remarks that disturbed the morale of the people, and gave Tian Feng the death penalty and the battle of Guandu.

This also shows from the opposite side that others should not be allowed to act or judge freely, and patiently and without prejudice tolerate opinions that are inconsistent with their own views or accepted views.

2. The negative case of "Zhuge Liang is three in"

First, after Battle of Red Cliffs, the following year, Zhou Yu went to seize Jingzhou, and Zhuge Liang took it first.

Second, Zhou Yu wanted to marry Sun Quan's sister to Liu Bei, detain Liu Bei and force Zhuge Liang to hand over Jingzhou. Unexpectedly, Zhuge Liang used a trick to make Zhou Yu "lose his wife and lose his soldiers."

Third, Zhou Yu begged Liu Bei to repay Jingzhou's shortcomings, and led an unsuccessful attack, which led to illness. Before he died, he said, "If you were born, how can you understand!" I am so angry that I am still alive.

Zhou Yu did not face Zhuge Liang with a tolerant attitude, which eventually led to his own death.