Why was Clausewitz's accumulation of knowledge not limited to books?
Clausewitz's accumulation of knowledge was not limited to books because he had been reading, thinking, and exploring all his life. When he was young, he began to read all kinds of philosophical and scientific works, including Newton's mechanics, Leibniz's calculus, and energetics. He also actively participated in various academic activities to communicate with scholars and scientists to obtain new knowledge and ideas. As time went on, Clausewitz gradually became an outstanding mathematician and physicist who had a deep understanding of the development of science and technology. He participated in many important scientific and engineering projects such as the invention and improvement of the steam engine, the development of electricity, and the development of aviation technology. In this process, he was constantly exposed to new knowledge and technology, and he absorbed inspiration and inspiration from them. Clausewitz was also concerned about society and the fate of mankind. He wrote many books on politics, philosophy, and morality in an attempt to provide useful thinking and decision-making suggestions. His knowledge and thoughts were not limited to books, but also came from his personal experience and concern for society and the fate of mankind.