What does the eldest son Yuansun retreat to Tian mean?

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Meixia Taoist Yangzhai Collection" Insert Huangquan upside down

"Huangquan Sutra" says:

Don't swim in the Huangquan. It is difficult for the eldest son to survive but to keep his younger brother;

Wu Ding did not go to Shuilu Kun, but killed the eldest son and lost his eldest grandson.

Gengshen You Xiang Kun, do not commit crimes, the waterway pit gate will be the culprit;

You Xinxu moved toward the water, and the eldest son Yuansun retreated to the fields.

Hai Renzi entered Qian Palace, and the water flow in the doorway was bound to be bad;

Zi Guichou did not meet Gen, and his children and grandchildren did not see the old man of the family.

Yinjia Mao will be inauspicious towards Gen, and the six things will end in miscarriage:

Mao Yichen will be in distress towards Xun, and widows and widowers will be lonely and entangled with death.

Don't meet Kun and Ding Geng, for Gen and Guijia will cause many disasters;

This also means that there is no way to go to the underworld. The source is as above. These should be taboo things when choosing a location for a Yangzhai. The first half of each sentence should refer to the orientation and the like, and the second half of the sentence should be about the uneasiness that may be caused by the previous orientation or Fengshui building the house. The so-called The eldest son yuansun should refer to the eldest son and grandson, who is the heir to the family property under normal circumstances. The retreat field may mean that the family property is not guaranteed.