《资治通鉴·汉纪·汉纪四十三》
虞诩上书顺帝，保荐议郎、南阳郡人左雄说： 我看到，当今公卿以下的官吏，大多属于专会拱手作揖而不敢说话的好好先生，把到处讨好广结善缘的人，视为贤能，而把为国尽忠尽职的人，视作愚蠢，甚至还互相告诫说： 不可做白璧，和气多后福。 
诩上疏荐议郎南阳左雄曰： 臣见方今公卿以下，类多拱默，以树恩为贤，尽节为愚，至相戒曰： 白璧不可为，容容多后福。 
Yu Xu submitted a letter to Emperor Shun, recommending Zuo Xiong, the consultant and a native of Nanyang County: "I have seen that most of the officials below the current dukes and marquises are mostly so-called yes-men who dare not speak out, and regard those who try to please everyone as virtuous, but those who are loyal to the country and perform their duties as foolish, and even warn each other: "Don't be a perfect person, flattery will bring you great blessings."