《韩非子·解老》
义是指君臣上下的联系，父子贵贱的差异，知交朋友的交往，亲疏内外的分别。
义者，君臣上下之事，父子贵贱之差也，知交朋友之接也，亲疏内外之分也。
Yi refers to the connection between the emperor and his courtier, the difference between the father and son, the interaction between friends, and the distinction between intimacy and alienation.