《黄帝四经·经法·论》
月亮十五时饱满而初一时却消失不见，其盈亏满损皆有常规，这是由它的生死气数所决定的客观规律。
月信生信死，进退有长，数之稽也。
The moon is full on the fifteenth of the month but disappears on the first; its waxing and waning are all regularities, which are objective laws determined by its vital momentum.