Coarse jingles such as "good is rewarded, evil is rewarded", "price is determined by quality" and "Reputation determines sales" cannot accurately and comprehensively reflect the social laws determined by the resonance of the best in human nature — The higher the level of behavior quality, the more returns you will get. This is a quantitative law of exchange in which behavior quality participates. It can be called the law of mass exchange, or simply the law of mass. The positive case of the law of quality exchange is that "one can realize one's good wishes by improving the quality of behavior" (its negative case means that it is difficult to achieve good wishes by reducing the quality of behavior). It can be seen that fulfilling one's wishes with quality is both an objective law and a code of conduct (or ethics). "Fulfillment of one's wishes with quality"is the basic principle of ethics, which can also become a high-level world view.