Sanming TonghuiVol. 1, On the Nature and Fortune of the Sixty Jiazi (verdicts & remarks)
Geng Xu Metal is the remnant of edge and sword, delighting in subtle Fire and Wood. Canopy [Hua Gai], Bastinado Punishment [Zhang Xing]. The four Metals of Ren Shen, Gui You, Geng Xu, and Xin Hai possess robust qi and do not mind ghosts.
Wu Zi Fire does not fear its ghost; it is the Fire of Thunderbolt within Water, possessed by divine dragons—for when there is Water, thunder roars. Yet if it encounters Bing Wu or Ding Wei Heavenly Water, it has reservations, as there is a clash of forces.
Generally, when the stems and branches of one's natal pillar are damaged, it indicates defects in the six sense faculties and having a beginning without an end, such as Ding Si meeting Gui Hai, or Ren Zi meeting Wu Wu. The rest follow this pattern.