I recommend a few books with deep thoughts.

The following are some books with depth of thought: 1. Sabiens: A Short History of Humanity by Yuval Harari This book tells the history of human beings from the Stone Age to the 21st century, exploring the origin, development and future of human civilization. It raised many profound questions such as the nature of human beings, the impact of technology on society, the origin of culture and religion, and so on. 1984 (Nineteen Eighty-Four) by George Orwell The novel depicted the scene of a dictatorial state and explored the effects of political power and control on humans. It is widely regarded as one of the representative works of dystopian novels, which deeply pondered the issues of political power, freedom and human rights. When Breath Becomes Air-Stephen Hawking The book described Hawking's experiences during the worsening of Lou Gehrig's disease and his thoughts on the meaning of the universe and life. It explored science, philosophy, and the meaning of human existence. It was a novel with depth and inspiration. 4 The Capital-Karl Karl Karl This book was a classic economic work that explored the nature and operating mechanism of the capitalist economic system. It raised many profound questions such as labor, commodity exchange, capital, exploitation, class struggle, and so on. The Most Innocent Pleral-Wang Xiaobo This book was a collection of essays by Wang Xiaobo, which included his thoughts on culture, politics, society, and human nature. It explored human nature, freedom and peace, and other issues that had important implications for contemporary society.