Mr. Hu Shi, a famous scholar in China, said: "Laozi is the originator of China's philosophy and the first real philosopher in the history of China's philosophy". Lu Xun said, "If you don't read Laozi, you don't understand the culture of China". Mao Zedong said, "The Tao Te Ching is a book of war". There are many versions of Laozi in Germany. When it comes to birthdays and weddings, people always copy a few words from Laozi and write them as banners or as mottoes. A German scientist has obtained a latest scientific achievement. He searched almost all philosophical books, and found no philosophical basis for the principles of his scientific achievements. Finally, I found it in Laozi's Tao Te Ching. He said with great excitement: "The cutting-edge of modern science is nothing more than a concrete example of the philosophical works written by Laozi thousands of years ago"! The above comments show that Laozi's thought is (profound)