《黄帝内经·素问·五常政大论》
流衍的年份，是水气封藏，寒气执掌万物的变化，天地间严寒阴凝，闭藏之气行使其权力，火的生长之气不得发扬。
流衍之纪，是谓封藏，寒司物化，天地严凝，藏政以布，长令不扬。
In the long run, water qi is sealed away, cold qi dominates all the changes, the heaven and earth are extremely cold and gloomy, energy of closure exerts its power, and qi of fire's growth cannot boom.