《韩非子·八经》
君主对国外的要求总是给予满足，对亲信的主张总是言听计从；这就是乱臣所要利用的。
所畏之求得，所爱之言听，此乱臣之所因也。
The ruler always satisfies the demands of external forces, and always heeds the opinions of his favorites; this is what rebellious subjects desire to make use of.