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Humans are matched with Heaven and Earth, collectively known as the "Three Powers" (San Cai), and the human body is essentially a microcosm of the universe. All principles governing the cosmos correspond to those within the human body; without discussing them all, let us examine how pulse diagnosis aligns with the Five Elements (Wu Xing), which is as clear as looking at one's own palm. I shall elaborate on this.

The North corresponds to the Kan trigram, representing the position of Water. The South corresponds to the Li trigram, representing the position of Fire. The East corresponds to the Zhen trigram, representing the position of Wood. The West corresponds to the Dui trigram, representing the position of Metal. The Center corresponds to the Kun trigram, representing the position of Earth. Imagine standing facing south to observe the positions of the pulses in both hands. The Heart belongs to Fire and resides in the Cun position (inch position, near the wrist crease), which is also in the South. The Kidneys belong to Water and reside in the Chi position (cubit position, further up the arm), which is also in the North. The Liver belongs to Wood and resides on the left side, which is also in the East. The Lungs belong to Metal and reside on the right side, which is also in the West. The Spleen belongs to Earth and resides in the Guan position (bar position, between Cun and Chi), which is also in the Center.

Speaking from the perspective of the generating cycle (Sheng) of the Five Elements: "Heaven generates One with Water." Thus, it begins with Kidney Water at the Left Chi position generating Liver Wood at the Left Guan position, and Liver Wood generating Heart Fire at the Left Cun position. Heart Fire, as the Sovereign Lord, occupies the highest position and cannot descend; therefore, it delegates authority to Ministerial Fire (Xiang Huo). Ministerial Fire resides in the Right Kidney. Although the Kidney fundamentally belongs to Water, Fire resides within it. This is like a dragon lurking at the bottom of the sea, accompanied by fire. Ministerial Fire at the Right Chi position generates Spleen Earth at the Right Guan position, and Spleen Earth generates Lung Metal at the Right Cun position. Lung Metal then generates Water again, cycling endlessly. This is the principle of generation.

Furthermore, speaking from the perspective of the controlling cycle (Ke) of the Five Elements: Ministerial Fire is at the Right Chi position and will eventually control Metal. Fortunately, the opposing Left Chi position contains substantial Kidney Water. When Fire is controlled by Water, it does not over-control (Cheng) Metal. Spleen Earth is at the Right Guan position and will eventually control Water. Fortunately, the opposing Left Guan position contains substantial Liver Wood. When Earth is controlled by Wood, it does not insult (Wu) Water. Lung Metal is at the Right Cun position and will eventually control Wood. Fortunately, the opposing Left Cun position contains substantial Heart Fire. When Metal is controlled by Fire, it does not rob (Zei) Wood. The three positions on the right hand are all controlled by the three positions on the left hand, yet the three positions on the left hand seem to have no controllers. Why is this? Lung Metal at the Right Cun position has its offspring, Kidney Water, which can avenge its mother's enemy (by controlling Fire). Spleen Earth at the Right Guan position has its offspring, Lung Metal, which can avenge its mother's enemy (by controlling Wood). Ministerial Fire at the Right Chi position has its offspring, Spleen Earth, which can avenge its mother's enemy (by controlling Water). Thus, those who are controlled can also control others; mutual control serves to mutually complete each other. This is the principle of control. If humans can embody the Dao of Heaven and Earth to preserve their bodies, how could the pulse be disordered?