《汉书·传·贾邹枚路传》
所以，父子之情，出白天性；忠臣犯颜直谏，不惜生命，国家政治就不会失策而功流万世。
故父子之道，天性也；忠臣不避重诛以直谏，则事无遗策，功流万世。
Therefore, the affection between father and son comes from natural human nature; when loyal ministers dare to remonstrate without regard to their lives, the state’s politics will not make mistakes and will achieve everlasting merit.