《汉书·传·淮南衡山济北王传》
衡王听说后，怕他泄露其秘密，便上书告太子大逆不道。
王闻之，恐其言国阴事，即上书告太子，以为不道。
After hearing about it, Heng Wang was afraid that he would leak his secrets, so he wrote a book to inform the prince of his great treason.