《韩非子·备内》
做君主而非常相信他的儿子，奸臣就能利用他的儿子来实现自己的私利，所以李兑辅助赵壬最终饿死了主父。
为人主而大信其子，则奸臣得乘于子以成其私，故李兑传赵王而饿主父。
If the sovereign trusts his son excessively, the cunning minister can take advantage of his son to fulfill his own selfish interests. So Li Dui helped Zhao Ren to finally starve his lord to death.