Ziji, the prince of Wei, met his teacher, Mr. Tian Zifang, on the road. Ziji alighted from his cart and paid respect to his teacher. But Tian did not reciprocate. Enraged, Ziji said to his teacher, "Who could condescend to others. A noble and wealthy man or a low and poor man?" Tian replied, "Only the low and poor man could. How could a noble and wealthy man do the same? If a king condescends to his subjects, he will lose his kingdom. If a nobleman condescends to others, he will lose his fiefdom. I have heard that no one would treat the king without his kingdom as a king, nor the nobleman without his fief as a noble.  As for the poor and low, they could put on their sandals and leave if people do not like their words or behavior. Is there any place where they could not go?" So, Ziji apologized to Mr. Tian.