The articulation between theory and practice is an essential link in the development of psychoanalysis. Recovering this relationship, especially with regard to the formulation of the concept of "transference" based on Freudian clinical experience and its Lacanian (re)reading, is strategic for understanding the limits and scope of the analyst's work. As an imperative for the functioning of the analytical device, the transference is the phenomenon that best represents the compulsory link between praxis and episteme, acting in the establishment of the device as a technical-theoretical instrument to be considered in the direction of treatment. Taking the Freudian elaboration of the concept of transference as a triggering element, this book presents some reflections on the phenomenon, its possibilities for interlocution and developments. It starts from Freud's theoretical-clinical elaboration towards Lacan's reinventive purification.