七十四难曰∶经言春刺井，夏刺荥，季夏刺俞，秋刺经，冬刺合者。何谓也？然春刺井
者邪在肝，夏刺荥者邪在心，季夏刺俞者邪在脾，秋刺经者邪在肺，冬刺合者邪在肾。
滑氏曰∶荥俞之系四时者，以其邪各有所在也。
其肝心脾肺肾，而系于春夏秋冬者。何谓也？然五脏一病辄有五也。假令肝病，色青者
肝也
，臊臭者肝也，喜酸者肝也，喜呼者肝也，喜泣者肝也。其病众多，不可尽言也。四时有数
，而并系于春夏秋冬者也。针之要妙，在于秋毫者也。
滑氏曰∶五脏一病，不止于五，尤众多也。虽其众多，而四时有数。故并系于春夏秋冬
，及
井荥俞经合之属也。用针者，必精察之，详此篇文义，似有缺误。今且根据此解之，以俟知者
。
《六十三难》曰∶十变言五脏六腑荥合，皆以井为始者何也？然井者东方春也，万物之
始生
，诸 行喘息 飞蠕动当生之物，莫不以春生。故岁数始于春，日数始于甲。故以井为始也
。（ 去知切，蠕音软。）
滑氏曰∶十二经所出之穴，皆谓之井。而以为荥俞之始者，以井主东方木，木者春也，
万物
发生之始，诸 者行，喘者息，息谓嘘吸气也。公孙弘传，作 行喙息，义尤明白。 者飞
，蠕者动，皆虫豸之属。凡当生之物，皆以春而生，是以岁之数则始于春，日之数则始于甲
。人之荥合则始于井也。冯氏曰∶井谷井之井，泉源之所出也。四明陈氏曰∶经穴之气所在
则自井始，而留荥注俞，过经入合，故以万物及岁月日数之始为譬也。
Nan Jing (Classic of Difficult Issues) Chapter 74 states: The classic text says that in spring, one punctures the Jing-Well points; in summer, the Ying-Spring points; in late summer, the Shu-Stream points; in autumn, the Jing-River points; and in winter, the He-Sea points. What does this mean? It is answered thus: In spring, one punctures the Jing-Well points because the pathogenic factor is in the Liver; in summer, one punctures the Ying-Spring points because the pathogenic factor is in the Heart; in late summer, one punctures the Shu-Stream points because the pathogenic factor is in the Spleen; in autumn, one punctures the Jing-River points because the pathogenic factor is in the Lung; and in winter, one punctures the He-Sea points because the pathogenic factor is in the Kidney.
Master Hua (Hua Shou) said: The reason why Ying-Spring and Shu-Stream points are associated with the four seasons is that the pathogenic factors reside in specific organs.
Why are the Liver, Heart, Spleen, Lung, and Kidney associated with Spring, Summer, Autumn, and Winter respectively? It is answered thus: When any of the Five Zang Organs becomes diseased, there are typically five manifestations. For example, in Liver disease, a greenish complexion indicates Liver involvement; a foul odor resembling mutton suggests Liver involvement; a preference for sour taste indicates Liver involvement; a tendency to shout suggests Liver involvement; and weeping indicates Liver involvement. There are numerous such symptoms, which cannot be exhaustively listed. The principles of puncturing according to the four seasons have fixed rules and are all associated with Spring, Summer, Autumn, and Winter. The subtlety of acupuncture lies in being as precise as the tip of an autumn down feather.
Master Hua (Hua Shou) said: A single disease of the Five Zang Organs has more than five manifestations, indeed numerous ones. Although numerous, the principles of puncturing according to the four seasons are fixed. Therefore, they are all associated with the four seasons and the categories of Jing-Well, Ying-Spring, Shu-Stream, Jing-River, and He-Sea points. Practitioners of acupuncture must examine these carefully. Upon detailed reading of this chapter's text, it appears there may be omissions or errors. For now, I will explain based on this interpretation, awaiting correction from experts.
Nan Jing Chapter 63 states: The Shi Bian (Ten Transformations) chapter asks why the Ying-Spring and He-Sea points of the Five Zang and Six Fu Organs all begin with the Jing-Well points? It is answered thus: Jing-Well points correspond to the East and Spring, which is the beginning of the generation of all things. All creatures that walk, breathe, fly, or crawl, without exception, are born due to Spring. Therefore, the annual cycle begins with Spring, and the daily cycle of Heavenly Stems begins with Jia (the first stem). Thus, the Jing-Well points are considered the beginning. (The character "Xing" is pronounced with the tone of "Quzhi", and "Ru" is pronounced like "Ruan".)
Master Hua (Hua Shou) said: The exit points of the Twelve Meridians are all called Jing-Well points. They are regarded as the beginning of Ying-Spring and Shu-Stream points because Jing-Well points govern the Wood element of the East, which corresponds to Spring, the beginning of the generation and growth of all things. "Xing" refers to walking; "Chuan" refers to breathing, where "Xi" means exhaling and inhaling. In the Biography of Gongsun Hong in the Book of Han, it is written as "Huixing Huixi" (creatures moving by mouthparts and breathing), which makes the meaning even clearer. "Fei" refers to flying; "Ru" refers to wriggling/crawling, both belonging to insects and worms. All living things that are meant to grow do so in Spring. Hence, the count of years begins with Spring, and the count of days begins with Jia. Similarly, the Ying-Spring and He-Sea points of the human body begin with the Jing-Well points.
Master Feng said: The "Jing" in Jing Valley refers to the source from which spring water issues forth. Master Chen of Siming said: The Qi of the acupoints resides starting from the Jing-Well points, then stays at the Ying-Spring points, flows into the Shu-Stream points, passes through the Jing-River points, and enters the He-Sea points. Therefore, metaphors of the beginning of all things and the counting of years, months, and days are used.