By the approach through abnormality we have succeeded in penetrating most deeply into the darkness of human nature ... The literary person should be the last person to be surprised at this fact. Sooner might he be surprised that he, considering his strong generally and individual tendency, should have so late become aware of the close sympathetic relations which connected his own existence with psychoanalytic research and the life-work of Sigmund Freud. I realized this connection only at a time when his achievement was no longer thought of as merely a therapeutic method, whether recognized or disputed; when it had long since outgrown his purely medical implications and become a world movement which penetrated into every field of science and every domain of the intellect: literature, the history of art, religion and prehistory; mythology, folklore, pedagogy, and what not.