《汉书·传·霍光金日磾传》
于是就上书进言道： 霍氏权势太盛，陛下即使很厚爱他们，也应该时时加以克制，不要让他们走上毁灭的道路。 
乃上疏言： 霍氏泰盛，陛下即爱厚之，宜以时抑制，无使至亡。 书三上，辄报闻。
So he wrote a letter to the emperor to say: The Huo clan is too powerful. Even if His Majesty loves them very much, he should always restrain them and not let them go down the road of destruction. 