This is a couplet in praise of Confucius. Among them, "Dacheng" refers to the main hall of the Confucius Temple in Qufu - Dacheng Hall. Dacheng Hall is the main hall of the Confucius Temple. It has double eaves and nine ridges, yellow tiles and flying rafts, and is surrounded by corridors. Together with the Taihe Hall of the Forbidden City and the Song Tiankuang Hall of Dai Temple, it is also known as the Oriental Three main halls. In the Tang Dynasty, it was called "Wenxuan Palace". "Dacheng" was renamed Dacheng Hall because Zhao Ji, Emperor Huizong of the Song Dynasty, honored Confucius as "the great achievement of ancient sages and sages", and a plaque was written on it. Mencius once said this about Confucius: "Confucius calls it a great achievement. A great achievement has the sound of gold and the vibration of jade. The sound of gold is the beginning of order; the sound of jade is the end of order." "Golden Sound" and "Yu Zhen" represent the whole process of playing music, starting with the striking of the bell (golden sound) and ending with the striking of the rock (jade vibration). This symbolizes the culmination of Confucius' thoughts from ancient sages and sages, and praises Confucius' great contribution to culture. Therefore, later generations named the first stone square in front of the Confucius Temple "Jin Sheng Yu Zhen". It was inscribed by the famous calligrapher Hu Zuanzong. "Teacher of all ages" is a plaque inscribed by Emperor Kangxi of the Qing Dynasty in the middle of the Dacheng Hall.