Missing Xia

Drinking in the bamboo forest, the old man asked: "What is a knight?" "Promote righteousness and eliminate evil, maintain the laws of the country; provide relief and sympathy for disasters, and comfort the common people." "Why do you want to be a hero?" "Study in both civil and military affairs, sharpen the moral integrity of the saints; go alone in the world, and understand the changes in the world." "Hahahaha, then why don't we see this [Xia] in this world?"