I picked up this book based on the recommendation from British pop icon, Morrissey. Previously, I had never heard of Pessoa. Morrissey commented in a magazine that once you start reading this book, you won't put it down. And he was right!
Let me first say this book is astonishing in every way. Written in a prose/poetry/diary format, the images and landscapes invade your imagination and stay with you. With imagary such as: "To drag my feet homeward weighs like lead on my senses. The caress of extinction, the flower proffered by futility, my name never pronounced, my disquiet like a river contained between the banks, the privilege of abandoned duties, and - around the last bend in the ancestral park - that other century, like a rose garden." (page 391)
At times, it reads like a beautiful suicide note. But just when you think he's ready to do himself in, he says: "In certain particularly lucid moments of contemplation, like those of early afternoon when I observantly wander through the streets, each person brings me a novelty, each building teaches me something new, each placard has a message for me." (page 297)
I would say that Pessoa was the greatest writer to never publish. And the greatest of poet-philosophers to never exist. His place in history is long overdue. He should stand with the likes Baudelaire and Goethe and tower over most 20th century authors.
In summary, Pessoa has invented a new language for the forgotten, the alienated, the damned, the dispossessed, the "disquieted". The "Book of Disquiet" is the greatest masterpiece never finished. Read it with caution. You may find yourself in love with words again.