There is a famous saying in ancient China, don't do it with small goodness, and don't do it with small evils. In other words, although the bad thing is small, it can't be done, and if it is done too much, it will become a big bad thing; Although a good thing is small, it cannot be stopped just because it is small. No matter how big a good thing is, it starts from a little bit. This sentence comes from Chen Shou's Biography of the Three Kingdoms in the Western Jin Dynasty.