《隋书·列传·卷三》
郑译说： 愿殿下弘扬仁孝，不失为子之道而已，不要为别的事担心。 
译曰： 愿殿下勉著仁孝，无失子道而已。勿为他虑。 
Zheng Yi [told the prince] "I only wish for Your Highness to show benevolence and filiality, and not lose the way of a son. You should not worry about other matters."