The concept of “thought-transference” holds a special position within the psychoanalytic field. It is first an object in the margins because it originated in the psychical sciences of the late-nineteenth century. It is also an object extracted by psychoanalysis from the darkness of the occultism, Freud considering thought-transference as the kernel of truth in occult beliefs. However, it is also a foreign body because, even if it was apprehended by different authors, it remains uneasily integrated into the psychoanalytic corpus. In this article, we demonstrate how this concept had first played a heuristic role vis-à-vis the theorization of transference and countertransference. We then illustrate how it was taken over by successive generations of analysts and retrace the heated debates it engendered. Finally, we bring out the relevance of this concept in terms of current clinical and theoretical issues.