《黄帝内经·素问·通评虚实论》
黄帝道：春季治病多取各经的络穴；夏季治病多取各经的俞穴；秋季治病多取六腑的合穴；冬季主闭藏，人体的阳气也闭藏在内，治病应多用药品，少用针刺砭石。
帝曰：春亟治经络，夏亟治经俞，秋亟治六腑府，冬则闭塞。闭塞者，用药而少针石也。
The Yellow Emperor said: "In spring, treat diseases by mostly using the network points of each meridian; in summer, treat diseases by mostly using the back-shu points of each meridian; in autumn, treat diseases by mostly using the confluent points of the six fu organs; in winter, when yang qi is hidden inside, treat diseases should mostly use medicines, and less acupuncture and scraping."