《荀子·仲尼》
年轻的侍奉年长的，卑贱的侍奉高贵的，不贤的侍奉贤能的，这是天下的普遍原则。
少事长，贱事贵，不肖事贤，是天下之通义也。
The young serve the old, the lower serve the higher, and the less capable serve the more capable. This is the general principle in the world.