《礼记·祭统》
忠臣的事奉国君，孝子的事奉双亲，其忠其孝都来源于一个顺字。
忠臣以事其君，孝子以事其亲，其本一也。
The loyalty of a loyal minister in serving his monarch, and the filial piety of a filial son in serving his parents, both loyalty and filial piety originate from the word "accordance".