Content introduction: "The Book of Disquiet" is a collection of hundreds of essay fragments written by the famous Portuguese writer Fernando Pessoa for more than ten years. It is also an unfinished work and has been collected and compiled by many research experts. "The Book of Uneasiness" is a collection of essays that penetrate deeply into the soul. Pessoa invented multiple heteronyms with different images and personalities, allowing these heteronyms to think and write on their behalf, and write out the various inner feelings of modern people. This is the melancholic yet tender, free and pure inner world of a person who is far away from the crowd. It shows the loneliness and decisive beauty of human nature like never before. It is full of poetry and philosophy and has been praised as the spiritual bible of modern people. Every worthy soul longs to live the ultimate life, and every person who loves solitude is living himself to the maximum. And this can only be achieved by embracing loneliness.