《礼记·月令》
发令行事，不可使阴阳相犯，不可使刚柔相犯，不可使仁义违时。
毋变天之道，毋绝地之理，毋乱人之纪。
Issue orders and act, do not let yin and yang violate each other, do not let hardness and softness violate each other, do not let benevolence and righteousness violate the time.