Yuan, Heng, Li and Zhen are the four virtues in the Book of Changes, which are taken from the growth process of natural plants.
Yuan: It symbolizes the beginning of a thing, corresponding to spring, the germination of plants.
H: It symbolizes the growth of a thing and corresponds to the growth of plants in summer.
Benefits: It symbolizes the harvest of a thing, corresponding to the flowering and fruiting of plants in autumn.
Zhen: It symbolizes the collection of one thing, corresponding to winter, and the fallen leaves of plants are wintering.