The following are some recommended books suitable for introductory philosophy: 1 Sophie's World-Jostan Judd This was a novel where literature and philosophy coexisted. The protagonist, Sophie, was a young philosopher. Through her dialogue with her mentor, Maslow, she explored the meaning of human existence, spiritual level, interpersonal relationships and other issues. Being and Time-Martin Heidegger It was a philosophical classic that explored the nature of existence and the way humans exist. In the book, he proposed the idea that "existence is perceived", which gave a deep thought to the nature of human beings. 3. Nietzsche's Philosophy (Philosopher Psychologist Antichlist) -Walter Kaufmann This is a biography of Nietzsche's philosophy. It analyses Nietzsche's thoughts, actions, and literary works to explore the nature and influence of Nietzsche's philosophy. The book also introduced some of Nietzsche's psychological views and literary achievements. 4. A Discussion on the Origin and Foundation of Inequality Among Men by Jean-Jacques Russell This was a work on ethics by Jean Jacques Rouseau, which explored the origin of human society and the problem of equality. He proposed ideas such as "natural law" and "social contract theory." 5. On Liberty-John Stuart Mill This was a classic work of liberalism that explored the nature of freedom, the sources of rights, and limitations. The book's idea of "freedom is right" had an important enlightening effect on modern society.