《韩非子·八经》
君主同时重用两个大臣，二者权势相当，叫做卷祸，它的危害在于私家势力强大，劫杀君主的灾难会发生。
大臣两重提衡而不踦曰卷祸，其患家隆劫杀之难作。
When the monarch simultaneously reuses two ministers, their power is equal, which is called the disaster of the volume. The harm lies in the powerful private forces and the disaster of killing the monarch will occur.