Writing a book for oneself could record one's growth, experiences, and thoughts so that more people could understand one's thoughts and worldview. This was not only a way of personal expression, but also a contribution to society. Through writing, he could pass on his knowledge and experience to more people to help them better understand and explore the world. In addition, publishing books could also increase one's popularity and competitiveness, laying the foundation for future career development. Therefore, writing a book for himself was a meaningful and valuable thing. It could bring more practical value and meaning.