《国语·晋语·里克杀奚齐而秦立惠公》
服丧期间不哀痛却想求得君位，难以成功；乘国家动乱之机想回国执政，是有危险的。
不哀丧而求国，难；因乱以入，殆。
It is difficult to succeed if you don't grieve during the mourning period and want to seek the throne; it is dangerous to take advantage of the chaos in the country to return to power.