《黄帝内经·灵枢·九宫八风》
上面所说的八种风，凡是从当令节气相对的方向而来的，都属于虚风贼邪，因为是违背时令的不正之气，所以它能使人发生疾病。
此八风皆从其虚之乡来，乃能病人。
Of the eight winds mentioned above, wind that comes from a direction opposite the correct seasonal wind is considered deviant and evil, because it is an incorrect air current against the season, and it is capable of causing illness in people.