Sanming TonghuiVol. 1, On the Nature and Fortune of the Sixty Jiazi (verdicts & remarks)
Geng Zi Earth is hollow within Earth, forming houses and chambers; it delights in Wood and Metal. Wood Virtue Combination (Harmony), Cane Punishment. Geng Zi is an Earth of profound virtue.
It can overcome abundant Water and does not dread other Wood, for Wood loses all qi upon reaching Zi; if it encounters Ren Shen Metal, this is called the Bright Position Salary, and its nobility is certain. Xin Chou is an Earth of gathered blessings.
Abundant Wood cannot overcome it, for Chou is the storage of Metal and holds Metal within; meeting Wood, how could it be harmed?
The Jade Night Precious Mirror says: "Geng Zi and Xin Chou Earth cherish Wood and detest Water; seeing Wood brings officer status, while seeing Water is unbefitting."