手足三阳三阴，表里引经，循摄气上、气下。
答曰∶手法者在手，心传口授秘法。
太阳经 足膀胱，手小肠，上下循，下后补。
少阳经 足胆，手三焦，上下循，下后补刮。
少阴经 足肾，手心，下后刮战。
厥阴经 足肝，手包络，上下循，下后补。
阳明经 足胃，手大肠，上先提循，下后泻。
太阴经 足脾，手肺，上补，下后循提。
天有阴阳，风寒暑湿燥火，三阴三阳下应之。温凉寒热，四时气候温凉是也。温热者，
天之阳也；寒凉者，天之阴也。此乃天之阴阳也。地有阴阳，金木水火土，生长化收藏下应之。
辛甘酸苦咸，五味是也。辛甘淡也，地之阳也；咸酸苦者，地之阴也。此乃地之阴阳也。阴
中有阳，平旦至日中，天之阳也，阳中之阳也。阳中有阴，日中至黄昏，天之阴，阴中之阴
人身之阴阳，故人亦应之。人身之阴阳，外为阳，内为阴；背为阳，腹为阴；脏为阴，
腑为阳。心、肝、脾、肺、肾五脏为阴，胆与胃、大肠、小肠、膀胱、三焦六腑为阳。
所以知阴中之阴，阳中之阳也。阴阳者，何也?如冬病在阴，夏病在阳，春病在阴，秋
病在阳，知其所则施针，循、气上、气下也。背为阳，阳中之阳，心也；背为阳，阳
中之阴，肺也。腹为阴，阴中之阳，肝也；腹为阴，阴中之阴，脾也。
The three Yang meridians and three Yin meridians of the hands and feet have exterior-interior connecting relationships, with their Qi movements differing in ascending and descending directions.
Answer: The manipulation technique lies in the hands; it is a secret method that must be transmitted orally and understood through heart-to-heart teaching.
Taiyang Meridian (Greater Yang Meridian): Foot Bladder Meridian of Foot-Taiyang and Hand Small Intestine Meridian of Hand-Taiyang. They circulate up and down; after descending, tonification (Bu) is applied.
Shaoyang Meridian (Lesser Yang Meridian): Foot Gallbladder Meridian of Foot-Shaoyang and Hand Sanjiao Meridian of Hand-Shaoyang. They circulate up and down; after descending, tonification (Bu) and scraping (Gua) are applied.
Shaoyin Meridian (Lesser Yin Meridian): Foot Kidney Meridian of Foot-Shaoyin and Hand Heart Meridian of Hand-Shaoyin. After descending, scraping (Gua) and trembling/shaking (Zhan) are applied.
Jueyin Meridian (Terminal Yin Meridian): Foot Liver Meridian of Foot-Jueyin and Hand Pericardium Meridian of Hand-Jueyin. They circulate up and down; after descending, tonification (Bu) is applied.
Yangming Meridian (Yang Brightness Meridian): Foot Stomach Meridian of Foot-Yangming and Hand Large Intestine Meridian of Hand-Yangming. Ascending involves first lifting and circulating; descending involves purgation/draining (Xie).
Taiyin Meridian (Greater Yin Meridian): Foot Spleen Meridian of Foot-Taiyin and Hand Lung Meridian of Hand-Taiyin. Ascending involves tonification (Bu); descending involves circulating and lifting afterward.
Heaven possesses Yin and Yang, corresponding to the Wind, Cold, Summer-heat, Dampness, Dryness, and Fire (Six Qi). The Three Yin and Three Yang correspond to these below. Warmth, coolness, cold, and heat are the manifestations of seasonal climatic changes. Warm and hot belong to Heaven’s Yang; cold and cool belong to Heaven’s Yin. This is the Yin and Yang of Heaven. Earth also possesses Yin and Yang, corresponding to Metal, Wood, Water, Fire, and Earth (Five Elements). The processes of growth, transformation, and storage correspond to these below. Pungent, Sweet, Sour, Bitter, and Salty (Five Flavors) are examples. Pungent, Sweet, and Bland flavors belong to Earth’s Yang; Salty, Sour, and Bitter flavors belong to Earth’s Yin. This is the Yin and Yang of Earth. Within Yin there is Yang: from dawn to noon, it is Heaven’s Yang, which is Yang within Yang. Within Yang there is Yin: from noon to dusk, it is Heaven’s Yin, which is Yin within Yin. Human body’s Yin and Yang thus respond to this pattern. In the human body, the exterior is Yang, the interior is Yin; the back is Yang, the abdomen is Yin; Zang organs are Yin, Fu organs are Yang. The Five Zang organs—Heart, Liver, Spleen, Lung, Kidney—are Yin. The Six Fu organs—Gallbladder, Stomach, Large Intestine, Small Intestine, Bladder, Sanjiao—are Yang. Thus, one can distinguish Yin within Yin and Yang within Yang. What are Yin and Yang? For instance, winter diseases reside in Yin, summer diseases in Yang, spring diseases in Yin, and autumn diseases in Yang. Understanding these patterns allows for acupuncture application, utilizing techniques such as meridian circulation, guiding Qi upward, and guiding Qi downward. The back is Yang; among Yang, the Heart is Yang within Yang. The back is Yang; among Yang, the Lung is Yin within Yang. The abdomen is Yin; among Yin, the Liver is Yang within Yin. The abdomen is Yin; among Yin, the Spleen is Yin within Yin.