Laozi famously said "Be soft", and he said, "The softest in the world is the best in the world. The reason why "Tao" can circulate endlessly is that "Tao" has the characteristics of weakness, so it is said: "The weak people use Tao. Lao Tzu used the metaphor of "water": "There is nothing weaker than water in the world, and it is impossible to overcome the winner. It is also said: "The weak is better than the strong, and the soft is better than the strong. The world knows everything and can't do it. Lao Tzu emphasized that "the strong beam should not die" in order to teach people to be humble and humble, and to retreat for progress. If people do this, they can preserve their sanity, so they say, "Knowing their male and keeping their female is clear for the world;" For the world, Changde will not leave, and it will return to the baby. It means that people can be ambitious, but they should not try to be brave and win over others. They should hold the way of being weak and modest and keep their simple nature. Laozi emphasized "keeping soft" because he thought that everything in the world would decline one day except Tao. Therefore, it is said: "The wind will not end in the morning, and the shower will not last all day. Lao Tzu also thinks that things are unpredictable, so he said, "Happiness lies in misfortune, and misfortune lies in blessing." Lao Tzu emphasized "keeping soft" and asked people to be clear and self-controlled, not to be strong and competitive, otherwise they would not end well.