《太平广记·卷八十八·异僧二》
制度礼仪由上层人颁行，成为永久的规则，只要于事无害，何必拘守前代的规定。
夫制由上行，永世作则，苟事克无亏，何拘前代。
The system and etiquette are promulgated by the upper class and become permanent rules. As long as they are harmless, why should we stick to the regulations of previous generations?