《贞观政要·卷十·论畋猎》
臣子向国君提意见，必须言语委婉，措辞得体，借此以讽彼。
臣谏其君，甚须折衷，从容讽谏。
<ins>When a subject offers advice to the emperor, they must be tactful with their words and respectful with their choice of expressions, hinting at one thing while referring to another.</ins>