The Ten Heavenly Stems

ICore principles across four classical works

• Zi Ping Zhen Quan on exposure in the stems: The primary qi exposed in a stem establishes the pattern. Stems represent the ruling influence; the power of an Earthly Branch—for example, Jia hidden in Yin—must appear among the stems to take a fully leading role. Otherwise it remains latent potential.
• Di Tian Sui on the nature of stems: It describes the ten stems through philosophical poetry, such as towering Jia Wood and supple Yi Wood. It stresses: “Among the five yang stems, Bing is most yang; among the five yin stems, Gui is most yin. Yang follows qi rather than prevailing power; yin follows prevailing power without attachment.”
• Qiong Tong Bao Jian on climate adjustment: It places each stem in the natural setting of the twelve months, describing how vitality and decline differ through spring, summer, autumn and winter. See the climate-adjustment topic.
• Ming Li Yue Yan on combination and transformation: It organizes the conditions for the five stem combinations and explains how becoming occupied by a combination can suspend a stem’s normal generating or restraining function, substantially changing the Ten Gods’ interactions.

IIYang firmness and yin flexibility in the stems

This distinction in Di Tian Sui is used to discuss a stem’s resilience and whether it follows a dominant configuration:

1. The five yang stems: Jia, Bing, Wu, Geng and Ren. “Yang follows qi, not power.” The article treats even a slight living root or Resource/Peer support as a reason for a yang stem to resist submission to Officer or Seven Killings. It therefore does not readily classify such a chart as following the Killing force, using the image of refusing surrender even in defeat.
2. The five yin stems: Yi, Ding, Ji, Xin and Gui. “Yin follows power without attachment.” Yin stems are described as adapting to the situation: when the chart is dominated by powerful Seven Killings or Wealth, they follow the prevailing force and relinquish their own phase alignment, forming a following pattern. The article associates successful following with wealth and high status.

IIIThe five stem combinations

Jia–Ji combine as Earth, Yi–Geng as Metal, Bing–Xin as Water, Ding–Ren as Wood, and Wu–Gui as Fire. Ming Li Yue Yan and Zi Ping Zhen Quan discuss both favorable and adverse consequences of combination:

• Combination displaces other functions: A combined stem may become bound and unable to perform its usual work. For example, a chart relies on Hurting Officer to generate Wealth, but an exposed Direct Resource binds it in combination, so the Hurting Officer becomes occupied with Resource and no longer carries out its Wealth-generating role.
• Combining away an adverse influence: If Seven Killings is unfavorable, another stem may combine with it—for example, Yi appearing to combine with Geng, the Killing influence for Jia Wood. The text calls this “removing Killing while retaining Officer” and treats it as a major favorable turning point.
• Rival and competing combinations: For a Jia Wood Day Master flanked by two Ji Earth Wealth stems, the image is of divided attention between two spouses. The combination fails to transform and the useful influence becomes divided and impure.

IVPassages from the classics

Di Tian Sui states:

五阳皆阳丙为最，五阴皆阴癸为至。五阳从气不从势，五阴从势无情义。

Among the five yang stems, Bing is most yang; among the five yin stems, Gui is most yin. Yang follows qi rather than power; yin follows power without attachment.

NoteFire is yang within yang, hence Bing’s brilliance; Water is yin within yin, hence Gui’s subtle and hidden nature. The source explains this with an old gendered analogy: yang stems are likened to principled figures who resist surrender while any true qi remains, whereas yin stems are depicted as abandoning old ties and aligning with the prevailing ruler when circumstances change.

Zi Ping Zhen Quan states:

合有宜不宜，合多不为奇... 或为福，或为灾，必须变理而推之。

Some combinations are appropriate and others are not; having many is not remarkable… They may bring fortune or adversity, and must be interpreted through changing circumstances.

NoteA stem combination is not automatically beneficial. Binding an adverse influence can turn defeat into success; binding away the Resource that sustains the chart is instead described as a serious threat.