This is a motto about business economics. Outstanding figures in human history such as Newton, Einstein, and Roosevelt all suffered setbacks in securities investment. Newton said afterwards: "I can calculate the orbits of celestial bodies, but I cannot calculate the madness of human nature." This shows how valuable it is to remain rational and sober in the market, and to become a winner you must overcome your own weaknesses. Dare to insist on independent thinking and not follow what others say. As Buffett said: "We also have fear and greed, but we are fearful when others are greedy, and we are greedy when others are fearful." There are human weaknesses in trading, but this is the innate nature of human beings. It is difficult to completely overcome them, but their degree of expression can be controlled. Successful investors can successfully control them at a moderate level. Within the scope, do not let it affect rational thinking.