"Listening to be bright, listening to be dark" comes from The Biography of Wei Zhi, a Book of the New Tang Dynasty. Wei Zhi was born in Guantao (now Guantao County, Hebei Province). He was a political activist and historian in the early Tang Dynasty. When Emperor Taizong was an admonition officer, he was knowledgeable and outspoken, and made various suggestions to the emperor. He had a high prestige in the imperial court, and Emperor Taizong also respected him. Why is it dark? "Wei Zhi replied:" you are so clear and listen to it; So it is dark and biased. " This dialogue was recorded in more detail in the volume 192 of Zi Tong Zhi Jian edited by Sima Guang in the Northern Song Dynasty. It says that Wei Zhi answered Tang Dazong at that time: "Listening to everything is clear, but partial belief is dark. Take two wise emperors Yao and Shun and three bad emperors Qin Ershi, Liang Wudi and Yang Di as examples to illustrate.