What is the myth of "the essence of heaven and earth, the essence of the sun and the moon"?

It is clear that this thing is all kinds of energy between heaven and earth, the energy radiated by the sun and the moon, the aura of heaven and earth and the essence of the sun and the moon. From the Taoist point of view, it is the energy that people and any living thing depend on for survival. Some traditional physical training methods are refining qi, practicing qi, refining spirit and eliminating deficiency. Among them, the essence of the grain is the energy provided by the grain when it fails to break the grain. After breaking the grain, it adopts the aura of heaven and earth and the essence of the sun and the moon. Therefore, the aura of heaven and earth and the essence of the sun and the moon are energy.