《韩非子·外储说左上》
父子是至亲骨肉，但有时怒责，有时埋怨，都是因为怀着相互依赖的心理而又认为对方不能周到地照顾自己，雇用工人来播种耕耘，主人花费家财准备美食，挑选布币去交换钱币以便给予报酬，并不是喜欢雇工，而是说：这样做，耕地的人才会耕得深，锄草的人才会锄得净。
子父至亲也，而或谯或怨者，皆挟相为而不周于为己也。夫卖庸而播耕者，主人费家而美食，调布而求易钱者，非爱庸客也，曰：如是，耕者且深，耨者熟耘也。
A father and son are close flesh and kin, but there are times when they are angry or resentful toward each other, all because they depend on each other and feel that the other person is not taking good enough care of them. When people hire workers to sow seeds and cultivate the fields, or when masters spend their wealth preparing delicious food and using coins to pay them instead of goods, they are not doing it because they love the workers. Rather they are saying, “In doing this the farmers will plow more deeply, and the weeders will weed more thoroughly.”