What is Generation Cycle?

The productive cycle of the Five Elements: Wood generates Fire, Fire generates Earth, Earth generates Metal, Metal generates Water, Water generates Wood. In Liu Yao, a line that is generated by the month or day branch gains strength. A source spirit (原神) that generates the useful spirit is favorable for the reading.

Source: Bushi Zhengzong (卜筮正宗), Wang Hongxu, 1709