《魏书·列传·卷三十六》
遇有不便当朝说的，高允就请求私下相见。高宗知道高允的意思，把左右摒退后再等待他，对他十分敬重，有时早晨进宫晚上出来，有时几日在宫里，朝臣都不知他和皇帝说了什么。
事有不便，允辄求见，高宗知允意，逆屏左右以待之。礼敬甚重，晨入暮出，或积日居中，朝臣莫知所论。
If there was anything inconvenient to say in court, Gao Yun requested a private meeting. Gaozong knew what Gao Yun meant, dismissed his entourage and waited for him, treating him with great respect. Sometimes he entered the palace in the morning and came out at night, sometimes he stayed in the palace for several days, and the courtiers did not know what he had said to the emperor.