Deng Xiaoping's "no matter whether it's a white cat or a black cat, as long as it catches mice, it's a good cat" is a famous pragmatic saying. I think there is nothing wrong with Deng's theory of two cats. It has led China's reform and opening up and made brilliant achievements. Applying Deng's theory of two cats, this truth is not as important as honesty and benefiting the Lord, and it is not as important as people's happiness. The theory of "two cats" has always been better than the "practicality is truth" in the classic pragmatic speech, with vivid images and sharp contrast. China has such a special famous saying, which is the pride of China and a special contribution to the world.