Yin, Yang and the Five Phases

ICore principles across four classical works

• Di Tian Sui on the momentum of qi: The Five Phases are understood as a flowing field of qi. “Principle follows qi in motion; how could it be fixed? Its advance and retreat must not be ignored.” Generation and restraint are not rigid arithmetic. They depend on qi advancing, receding, following or opposing. This approach follows overwhelming strength rather than resisting it, and may have extreme weakness follow the dominant force rather than receive support.
• Zi Ping Zhen Quan on movement and stillness: “The ten stems are the Five Phases; yin and yang are originally one qi.” Yang is movement and dispersal; yin is stillness and contraction. The phases are first differentiated by yin and yang, and only then by their Ten Gods relationships.
• Ming Li Yue Yan on generation and restraint: It emphasizes practical interactions and remedies: “Fortune and adversity arise from generation and restraint.” No phase is inherently good or bad; what matters is its contribution to balancing the chart’s difficulty and remedy.
• Qiong Tong Bao Jian on climate adjustment: It returns the phases to their natural imagery: Metal, Wood, Water, Fire and Earth in the four seasons. Metal and Water tend toward cold yin qualities; Fire and Earth toward heat and dryness. Extreme yin or yang calls for climatic adjustment.

IIGeneration, restraint and destructive excess

Besides ordinary generation and restraint—Wood generating Fire or restraining Earth—extreme conditions can produce reversed or abnormal effects, as illustrated in Di Tian Sui:

1. Counter-restraint: the restrained side is stronger. “Wood restrains Earth, but excessive Earth breaks Wood”; “Fire restrains Metal, but excessive Metal extinguishes Fire.”
2. Excessive output: a strong child exhausts the parent. “Wood generates Fire, but excessive Fire burns Wood”; “Metal generates Water, but excessive Water submerges Metal.”
3. Excessive generation: the parent overwhelms the child. “Earth generates Metal, but excessive Earth buries Metal”; “Wood generates Fire, but excessive Wood makes Fire blaze.”

IIIChanging functions of yin and yang

• Pure yang does not grow; pure yin does not generate. The source calls an all-yang chart “solitary yang that does not grow” and associates it with fierce, isolated temperament; it calls an all-yin chart “cold yin that does not generate” and associates it with gloom. It considers the meeting of yin and yang in annual or cycle influences necessary for favorable development.
• Complementary yin–yang interaction: In Ten Gods theory, restraint between opposite polarities is called “affectionate restraint,” as with Direct Officer、Direct Wealth, associated with kindness and endurance. Restraint between the same polarity is called “unaffectionate restraint,” as with Seven Killings、Indirect Resource, which the source associates with sudden intensity and harshness.

IVPassages from the classics

Zi Ping Zhen Quan states:

天地之间，一气而已。惟有动静，遂分阴阳... 阳之散者，必归于敛，而阴阳气交，而五行存焉。

Between Heaven and Earth there is only one qi. Movement and stillness divide it into yin and yang… What yang disperses must return to contraction; yin and yang qi meet, and the Five Phases exist within their interaction.

NoteHeaven and Earth are described as one undifferentiated qi. Its movement and outward release are yang; its stillness and contraction are yin. The Five Phases are therefore different states of this interaction. Reading a chart is, in this framework, reading the movement of qi.

Di Tian Sui states:

理承气行岂有常，进退之机不可罔。

Principle follows qi in motion; how could it be fixed? Its advance and retreat must not be ignored.

NoteGeneration and restraint change with the movement of qi rather than obeying an unqualified rule. Water restrains Fire, for example, but a little Water in intense summer Fire may evaporate without restraining anything. The central task is to read increase, decline, fullness and depletion.