《逸周书·卷三·文传解》
出令专一叫神明，政出二臣叫分光，政令三出叫无适异，政令四出叫无所适从。
出一曰神明，出二曰分光，出三曰无适异，出四曰无适与。
Issuing a single order is called divine, issuing two orders is called dividing light, issuing three orders is called no difference, and issuing four orders is called no way to follow.