When C. G. Jung partnered with Sigmund Freud, he already had a broad knowledge of world mythology and an understanding of the unconscious formed largely from Schopenhauer’s Will and Nietzsche’s Dionysian energy of nature, or physis. Unwilling to reduce this unconscious—matrix of dreams, myth, and literature—to Freud’s infantile sexual libido, Jung’s break with Freud was inevitable. His long...