In the five elements of numerology, Geng Jin gives birth to Gui Shui, Tian Gan Mu corresponds to A and B, Tian Gan Huo corresponds to C Ding, Tian Gan Tu corresponds to Si Qi, Tian Gan Jin corresponds to Geng Xin, and Tian Gan Shui corresponds to Nondecyl. The order of the five elements is wood fire, fire gives birth to soil, soil gives birth to gold, and gold gives birth to water, so it corresponds to wood ding fire, wood ding fire, Wuji gives birth to Geng Xin gold, and Jin Xin gives birth to non-cassia water, so Geng Jinsheng is cassia water.
Geng Jin represents the metal of pure yang, which has strong cold power, while Gui Shui represents Yin Shui, which is tangible and intangible. In the eight-character numerology, people who are mainly Geng Xin are named as official injuries. Because the water hurts the official, it hurts the official for the golden water. The book says that people who are injured by Jinshui are smart and lewd. People who are injured in Jinshui have more divergent thinking, more active thinking and more refined appearance than ordinary people. Wealth and official luck are better, but we should also pay attention to our own behavior.