Jin, a man with an officer to qiu TaoKan, be free and at leisure, often is the morning brick (Pi) to move out from the room, it's getting dark moved back. The cycle repeats, tireless. Some people saw this and then asked why. Tao kan replied, I am afraid that he is too accustomed to doing great things in the future. Later, people use "yun Pi" self-help diligence, not afraid of to and fro; With "yun Pi urn, yun Pi person" refers to such as togeher the idle, the hard work.