These are the words of the psychologist C. G. Jung in 1957, referring to the decades he worked on The Red Book from 1914 to 1930. Although its existence has been known for more than eighty years, The Red Book was never published or made available to the wide audience of Jung’s students and followers. Nothing less than the central book of Jung’s oeuvre, it is being published now in a full facsimile edition with a contextual essay and notes by the noted Jung scholar Sonu Shamdasani and translated by Mark Kyburz, John Peck, and Sonu Shamdasani. It will now be possible to study Jung’s self-experimentation through primary documentation rather than fantasy, gossip, and speculation, and to grasp the genesis of his later work. For nearly a century, such a reading has simply not been possible, and the vast literature on his life and work has lacked access to the single most important document. This publication opens the possibility of a new era in understanding Jung’s work. It provides a unique window into how he recovered his soul and constituted a psychology. It is possibly the most influential hitherto unpublished work in the history of psychology. This exact facsimile of The Red Book reveals not only an extraordinary mind at work but also the hand of a gifted artist and calligrapher. Interspersed among more than two hundred lovely illuminated pages are paintings whose influences range from Europe, the Middle East, and the Far East to the native art of the new world. The Red Book, much like the handcrafted “Books of Hours” from the Middle Ages, is unique. Both in terms of its place in Jung’s development and as a work of art, its publication is a landmark.