"The Book of Disquiet" is a work by Portuguese author Fernando Pessoa, published posthumously in 1982, although it was written between 1913 and 1935. The book is considered one of the great classics of Portuguese literature and is a notable example of Pessoa's fragmentary and multifaceted style.

The work consists of a series of reflections, thoughts, and aphorisms that express the anguishing search for meaning and identity of the narrator, who is often identified with the heteronym Bernardo Soares. The book addresses themes such as solitude, melancholy, existential unrest, and alienation in a modern world that often appears chaotic and indifferent.

"The Book of Disquiet" does not follow a linear narrative but presents a free structure, with entries that vary in tone and content, reflecting the complexity of the human interior. Pessoa's poetic and introspective language invites the reader on a deep journey through the human psyche, exploring the fragility of feelings and the constant tension between the desire to connect with the world and the inevitable separation that consciousness brings.

Through his prose, Pessoa invites the reader to share his anxieties and reflect on the human condition, the search for authenticity, and the struggle against the ephemerality of life."The Book of Disquie" is, thus, a work of great philosophical and literary depth, resonating with the universal human experience of unrest and the quest for meaning.