When the door is silent, half a day can be refreshing, what difference is there from the suffering of a swollen brain? The universe and all things remain unchanged, yet in half a day there is a distinction between up and down, whose fault is that?

False sound of the door, a sneeze, a deep thought, an enlightenment, the sound of the door is false while the sneeze has not yet come, causing a headache for half the day. I should quickly grasp the way of trading; the halfway can be used, and a suitable realm can be established, the road can be long. Others use failed trades to gain enlightenment, while I use a headache to gain enlightenment.