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The Way of Heaven (Qian) generates males, and the Way of Earth (Kun) generates females; this is indeed the supreme Dao of generation. However, how do we perceive it? And how do we apply it? The function of Qian and Kun lies in Kan and Li; and the function of Kan and Li is nothing other than Yin and Yang. Li originally resides in the Yang position, so why does it represent women? Because within Yang, there is the initial emergence of Yin; Kan originally resides in the Yin position, so why does it represent men? Because within Yin, there is the initial emergence of Yang. Generally, what is in the middle is abundant at the top; what is abundant must gradually decline. What is at the beginning is born from below; what is growing must gradually increase. Therefore, Yang is born from Kan, rising gradually from the left; as it rises, it becomes Yang and moves toward brightness. Yin is born from Li, descending gradually from the right; as it descends, it becomes Yin and moves toward darkness. This is the function of Yin and Yang, and all myriad transformations arise from it. Extending from this principle: Winter Solstice and Summer Solstice are the Yin-Yang changes of a year; Zi (East) and Wu (West) are the Yin-Yang changes of a day; Jieqi (Solar Terms) and Zhongqi (Mid-terms) are the Yin-Yang changes of monthly calendars; brightness and darkness are the Yin-Yang changes of seasonal climates; before and after solar terms are the Yin-Yang changes of waxing and waning; moonlight and tides are the Yin-Yang changes of fullness and emptiness. Further extending to humans: an old husband with a young wife may seem to have Yin prevailing over Yang, yet there is a subtlety of inversion and reversal; when one side is strong and the other weak, Yang still exists, possessing the power of control and release. In short, nowhere is there not the function of Yin and Yang. To know this and follow Yang while avoiding Yin allows one to embody the Way of Heaven generating males; to not know this and turn away from Yang toward Yin results in embodying the Way of Earth generating females. Those with clear insight should reflect upon and comprehend this; words find it difficult to fully express the intent.

Geographical advantages (Di Li) are no less important regarding offspring. There are Yin dwellings (tombs) suitable for descendants, where one often sees abundance like the "Zhongsi" (a metaphor for many children); there are Yang dwellings (residences) suitable for progeny, where only the Shengqi (Vital Qi) direction and Tianyi (Heavenly Yi/Noble Person) direction are considered most auspicious. However, auspicious land and auspicious people often meet by chance. It is said that virtue brings people, and people bring land; this cause-and-effect is certainly not accidental. Thus it is said: one must first have a virtuous heart/mind, and then have auspicious Yin land; this is truly not false talk. Yet its principles are profound and meanings subtle, not exhaustible in a single statement. Nevertheless, since it concerns the lineage, it is indeed something one cannot fail to know. Furthermore, regarding the location for marital intercourse, one must be most aware of taboos and appropriateness. One must avoid places near temples and shrines, beside wells, stoves, graves, and coffins, as well as areas illuminated by sun or moon fire, or those that are gloomy and dangerous—anywhere one feels their spirit and soul are unsettled. If one is not careful, consequences such as premature death, physical disabilities, sudden disasters, and the emergence of disloyal or unfilial individuals will follow, verifying as quickly as shadow follows form. Can one not be cautious!