I am so poor that I can gaze at the sky, and I can enjoy traveling in my spare time. The sky and the earth are vastly different, and I feel the infiniteness of the universe. When joy and sorrow come, I realize that there are countless ups and downs. I hope that Chang'an will be safe under the sun, and Wu will be in the clouds. The terrain is extreme but the southern sky is deep, the sky pillar is high and the northern star is far away. The mountains are difficult to overcome, who feels sad for those who have lost their way? When we meet by chance, we are all guests from a foreign land. The famous story in "Preface to the Pavilion of Prince Teng" tells that the talented king was filled with joy and sorrow after going up to the tower to have a feast.