《论衡·卷二十三·四讳篇》
房室、宅外又有什么不同呢？有的认为恶有的认为不恶，有的忌讳有的不忌讳，世俗间的防禁，竟然是没有固定标准的。
房室宅外何以殊，或恶或不恶，或讳或不讳，世俗防禁，竟无经也。
What is the difference between room, house and outside? Some think it is evil, some think it is not; some taboo it, some do not; the prohibitions in the world are not fixed.