《黄帝内经·灵枢·贼风》
那些既感觉不到有邪气侵袭，又没有惊恐等情志的过度刺激，却突然发病，这是什么原因呢？
其毋所遇邪气，又毋怵惕之所志，卒然而病者，其故何也？
What are the reasons that patients suddenly fall ill without feeling being attacked by pathogens and having emotional overstimulation?