《史记·八书·天官书》
一季不出，该季阴阳不和，四季不出，天下五谷不收，有大饥荒。
一时不出，其时不和；四时不出，天下大饥。
If it does not appear in a season, the yin and yang of that season will not be in harmony. If it does not appear in all seasons, the world's grains will not be harvested, and there will be a great famine.