《淮南子·时则训》
明堂的制度，静则以 准 为法则制度，动则以 绳 为法则制度；春天则用 规 来治理，秋天就用 矩 来治理，冬天则用 权 来治理，夏天就用 衡 来治理。这样，干燥、潮湿、寒冷、暑热都会按季节适时出现，甘甜雨露也会按时节适时降落。
明堂之制，静而法准，动而法绳，春治以规，秋治以矩，冬治以权，夏治以衡，是故燥湿寒暑以节至，甘雨膏露以时降。
The system of Mingtang is based on the principle of: stillness is governed by Zhun, and movement is governed by Sheng; spring is governed by Gui, autumn is governed by Ju, winter is governed by Quan, and summer is governed by Heng. In this way, dryness, humidity, cold, and heat will appear in their proper seasons, and sweet rain and dew will fall in their proper seasons. 