What is the most important idea of Laozi's Tao Te Ching?

Laozi was a great philosopher in the late Spring and Autumn Period of China. His book Tao Te Ching represents the highest level of China's philosophy development at that time. It is not only a treasure of China's traditional culture, but also a bright pearl in the history of world civilization. Although there are only more than 5,000 words, the ideological content is very rich, involving many aspects. Here is only a brief introduction to the part related to the construction of a harmonious human society, in order to teach the family.

Because Laozi and his works have always been divided, we can't reach an agreement, so before introducing this question, we must first explain what kind of views we will adopt as our argument basis. I don't intend to introduce all kinds of different opinions in detail here, because Mr. Ren has systematically summarized and analyzed all kinds of different opinions in the revised version of Lao Zi's New Translation 1985 Introduction published by Shanghai Ancient Books Publishing House in March, and put forward some good opinions on the basis of summarizing and analyzing all kinds of different opinions. The five thousand words in Tao Te Ching are basically Lao Zi's own works, and his thoughts reflect the wishes of workers and peasants to some extent. His view is also one of the foundations of this paper. In addition, on the basis of Mr. Ren's systematic summary, the professor made a detailed textual research on Lao Zi's life experience and thoughts in the book "Study of Lao Zi" published by People's Publishing House in August 2006. It is particularly worth mentioning that the Taoist culture headed by Laozi was put forward on the basis of textual research, and it is the product of critical inheritance of the Central Plains culture with Western Zhou culture as the core. "Laozi's thought is an integral part of the culture of the Central Plains" (page 108 of this book), and while demonstrating that Laozi has an extremely important influence on Confucianism and Buddhism, it also emphasizes its close relationship with Taoism. It is believed that Laozi is the founder of Taoist culture and the ancestor revered by Taoism, and his work Laozi is regarded as the main classic by Taoism and called "Moral Respect Classics". Its basic ideas were inherited and developed by Taoist priests in past dynasties. So he thinks that Tao and Tao are inseparable. If you leave Taoism and talk about Taoism, this Taoism has a head and no tail; On the contrary, if we talk about Taoism without it, it will be headless. His conclusion is that "Tao and Tao should be regarded as a whole" and he made a detailed argument about it (page 406-4 12 of this book). We basically agree with him. I think, perhaps this is the important reason why we invited not only Taoist leaders at home and abroad, but also experts and scholars from all walks of life such as culture and economy to participate in the discussion of the Tao Te Ching.