《礼记·礼运》
使用百姓要趁农闲，不夺农时，所以就没有水旱蝗螟之灾，也没有凶荒妖孽作祟。
用民必顺。故无水旱昆虫之灾，民无凶饥妖孽之疾。
The common people should be used during the slack farming season, so as not to take away their farming time. Therefore, there will be no droughts, floods, locusts, or pests, and no famine or evil spirits.