Some people often "take" other people's thermos bottles at school. The reason is that we are good at rationalizing our subtle dishonest thoughts and practices. The rationalization of taking thermos bottles is that I gave them to others, and I also took others', which is not stealing or taking them. Just like Kong Yiji, he rationalized his book stealing. Scholars steal books and take them away. Therefore, if you want to cut off this rationalization and increase people's guilt, you can reduce stealing hot water bottles. For example, posting a piece of money makes people subconsciously think of "stealing" or posting a piece of paper to a big book "thief" should prevent others from taking hot water bottles.