《韩非子·用人》
明君使职事不相干挠，所以不会发生争吵；使臣下不兼任官职，所以各自都有擅长的技能；使人们不为同一件事情而立功，所以不会发生争斗。
明君使事不相干，故莫讼；使士不兼官，故技长；使人不同功，故莫争。
The enlightened ruler makes sure that duties do not overlap, thus avoiding conflicts; he does not let his ministers hold concurrent posts, thus allowing each to develop his own special skills; he does not let men perform the same task, thus avoiding rivalry.