The emperor said to Xiao Yu, Prince of Shao Shi, "When I was a child, I liked bows and arrows. I had a dozen good bows. I thought there was nothing better than these. Recently, I showed them to the bow maker, but the craftsman said, "None of them are good bows. "I asked him why. He said: "the grain of wood is not straight, and the arrow can't be straight." "I realized that familiar things can't tell good from bad. I ride with a bow, pacify the quartet and unify the world. " So he ordered the officials above five grades in Beijing to take turns to live in Zhongshu Province and summoned them many times to ask about their folk sufferings and political gains and losses.