More than a decade before the release of the book that would make him famous, Robert M. Pirsig had already caught hold of the central theme that would animate Zen and the Art of Motorcycle Maintenance: “Quality,” a concept loosely likened to “excellence,” “rightness,” or “fitness” that Pirsig saw as kindred to the Buddhist ideas of “dharma” or the “Tao.” As he later wrote in Zen, “Quality is the Buddha.” Now readers have access to five decades of Pirsig’s personal writings in this posthumous collection that illuminates the evolution of his thinking to an unprecedented degree. Skillfully edited and introduced by Wendy K. Pirsig, Robert’s wife of four decades, the collection includes previously unpublished texts, speeches, letters, interviews, and private notes.