其象法地，血之府也，心之合也，皮之部也。
天阳地阴，气阳血阴。人之脉，以血为体，固当配地。然观其上下周匝，出入
脏腑，联系贯通，起伏交会，一如大气之行于地中。故地有脉而山川秀丽，人有脉
而形体安全。象之吻合，莫有肖于此者。故曰其象法地，能再因其象而取法焉。则
吾医之识脉，与堪舆之寻龙，无二义也。府者，藏也，聚也。隧道乃精专所注，故
为血之府。充遍人身，应夏火之气。中焦变赤，得正南之色，故为心之合。肺主皮
毛而朝百脉，如部落然，故为皮之部。（《素问》五脏生成篇云∶心之合脉也，其荣色也。又六节脏象篇云∶
心者生之本，其充在血。肺者气之本，其充在皮。又五脏生成篇云∶诸血者皆属于心，诸气者皆属于肺∶
又平人气象论云∶藏真高于肺，以行营卫阴阳。又经脉别论云∶脉气流经，经气归于肺。肺朝百脉，
输精于皮毛。毛脉合精，行气于府。）
资始于肾，资生于胃。阳中之阴，本乎营卫。
营者阴血，卫者阳气。营行脉中，卫行脉外。
肾为十二经脉之根，故曰资始。胃乃生化之源，故曰资生。肾之与胃，盖有先
后天之分焉。《灵枢》经脉篇云∶人始生，先成精，精成而脑髓生。骨为干，脉为营，
筋为刚，肉为强，皮肤坚而毛发长。谷入于胃，脉道以通，血气乃行。此即资始资
生之注脚也。所谓阳中之阴者，盖本乎营卫耳。营者营运于中，卫者护卫于外。营
为阴血，行脉之中，入隧道也。卫为阳气，行脉之外，不入隧道也。
Its form mimics the Earth; it is the mansion of blood, corresponds to the Heart, and is the domain of the skin.
Heaven is Yang, Earth is Yin; Qi is Yang, Blood is Yin. The vessels in the human body take Blood as their substance and should therefore correspond to the Earth. However, observing how they circulate up and down, enter and exit the Zang-Fu organs, connect and penetrate, rise and fall, and intersect, they are exactly like the Great Qi moving within the Earth. Thus, when the Earth has its veins (geological structures), the mountains and rivers are beautiful; when humans have pulses, their physical forms are secure. No resemblance is closer than this. Therefore, it is said that its form mimics the Earth, and one can further model upon this form. In this way, a physician’s understanding of pulse diagnosis is no different in principle from a geomancer’s search for the Dragon Vein (Xunlong). "Mansion" (Fu) means storage and gathering. The tunnels (referring to the vessels) are where essence and Qi concentrate, thus they are called the Mansion of Blood. The vessel Qi fills the entire body, corresponding to the Qi of Summer Fire. The Middle Jiao transforms into red, acquiring the color of the South, thus it corresponds to the Heart. The Lung governs the skin and hair and receives all the vessels (Chao Bai Mai), much like a tribe or settlement; thus, the vessels are the domain of the skin. (*Suwen*, Chapter on the Generation of the Five Zang Organs states: The Heart corresponds to the vessels, and its luster manifests in the complexion. Also, *Suwen*, Chapter on the Six Solar Terms and Visceral Images states: The Heart is the root of life, and its nourishment lies in Blood. The Lung is the root of Qi, and its nourishment lies in the skin. Also, *Suwen*, Chapter on the Generation of the Five Zang Organs states: All blood belongs to the Heart, and all Qi belongs to the Lung. Also, *Suwen*, Chapter on the Image of the Normal Person states: The True Qi of the Zang organs is superior in the Lung, which distributes Ying-Wei and Yin-Yang. Also, *Suwen*, Chapter on the Distinct Discussion of the Meridians states: Vessel Qi flows through the meridians, and meridian Qi returns to the Lung. The Lung receives all vessels, transmitting essence to the skin and hair. Skin and vessel combine their essence, allowing Qi to flow into the Mansion.)
Nourishment begins with the Kidney, and generation arises from the Stomach. The Yin within Yang is rooted in Ying and Wei.
Ying is Yin Blood, and Wei is Yang Qi. Ying circulates within the vessels, while Wei circulates outside the vessels.
The Kidney is the root of the Twelve Primary Meridians, hence it is said to be the source of initiation (Zi Shi). The Stomach is the source of transformation and production, hence it is said to be the source of generation (Zi Sheng). The Kidney and the Stomach represent the distinction between Pre-heaven and Post-heaven. *Lingshu*, Chapter on the Meridians states: When a person first comes into being, Essence is formed first; when Essence is formed, Brain and Marrow arise. Bone serves as the trunk, vessels serve as the Ying-nourishing channels, sinews provide firmness, flesh provides strength, the skin becomes tough, and hair grows long. Grain enters the Stomach, the vessel pathways become unobstructed, and Blood and Qi begin to flow. This serves as the annotation for "initiation by nourishment" and "generation by sustenance." What is meant by "Yin within Yang" is fundamentally based on Ying and Wei. Ying operates internally, while Wei guards externally. Ying constitutes Yin Blood, circulating within the vessels and entering the tunnels. Wei constitutes Yang Qi, circulating outside the vessels and not entering the tunnels.