《贞观政要·卷二·论纳谏》
说罢，他又转过头来对房玄龄说道： 看看玄素的奏表，洛阳的宫殿实在不应该修建，以后做事必须按事理行事，即使露天休息又如何呢？
顾谓房玄龄曰： 今玄素上表，洛阳实亦未宜修造，后必事理须行，露坐亦复何苦？
After saying that, he turned to Fang Xuanling and said: Look at Xuansu's memorial, the palace in Luoyang really shouldn't be built. We must do what's right in the future, even if we have to rest outdoors.