《黄帝内经·素问·六元正纪大论》
四之气，主气为太阴湿土，客气为阳明燥金，阳明主令，凉气乃至，炎暑之气间时而化，白露降下，人们和平无殃。
四之气，凉乃至，炎暑间化，白露降，民气和平。
The four Qi, the principal Qi is the Tai Yin damp earth, and the guest Qi is the Yang Ming dry gold. The Yang Ming gives orders, and when the cold air arrives, the heat of summer gradually dissipates and the white dew falls. People are peaceful and safe.