《黄帝内经·素问·五常政大论》
所以六气所主的司天在泉，各有制约的作用，而岁运在中秉五行而立，万物都有所生化，在泉之气制约我所胜者，司天之气制约岁气之胜我者，司天之气制色，在泉之气制形，五种虫类的繁盛和衰微，各自随着天地六气的不同而相应。
故气主有所制，岁立有所生，地气制己胜，天气制胜己，天制色，地制形，五类衰盛，各随其气之所宜也。
Therefore, there are mutually restraining effects between the six Qi that control and command the heavens and the Zhong, while the years and cycles are established based on the five elements, causing all living things to come into existence and undergo transformation. The Qi of the Zhong restrains that of the heavens, which conquers me, and the Qi of the heavens restrains that of the years and cycles, which conquers me. The Qi of the heavens controls colours, while the Qi of the Zhong controls forms. The flourishing and decline of the five classes of insects correspond with the changes of the six Qi of the heavens and earth.