Sanming TonghuiVol. 1, On the Nature and Fortune of the Sixty Jiazi (verdicts & remarks)
Jia Yin Water is rain, delighting in summer and Fire. True Lu Horse, God of Fortune [Fu Shen], Eight Monopolies [Ba Zhuan], Flat Head [Ping Tou], Broken Character [Po Zi], Suspended Needle [Xuan Zhen], Deaf and Mute [Long Ya].
Jia Yin is Water of self-illness; Yi Mao is Water of self-death. Although dead and ill, Earth cannot overcome them, because the two Woods of stem and branch can restrain Earth. If they encounter the Metal of Ren Yin or Gui Mao, they become affluent and plentiful.
*Wu Xing Yao Lun* states: 'The two Waters of Jia Yin and Ren Xu are concealed rebellion, where yin prevails over yang, indicating treacherous malice that harms things; only if tempered by Fire and Earth through proper balancing can they become vessels of great capacity.'