This study investigates the researcher's clinical experiences in different modes of treatment: private clinic, clinical mental health institutions and in the therapeutic accompaniment. The contact with hard cases patients led the researcher to identify that countertransference is a privileged clinical instrument for understanding and intervening with these patients. The objective of this work is to complexify the countertransference in multiple clinical activities. Freud, Heimann, Ferenczi and Winnicott are discussed in the company of Brazilian psychoanalysts-Barretto, Gondar, Kupermann and Safra-debating countertransference in the present psychoanalysis practice. It was reproduced excerpts from scientific literature and clinical vignettes provided by the researcher from their treatment in order to examine the use of countertransference in contemporary times. For Freud, countertransference was an obstacle to the analysis; for Heimann, the emotions of the analyst were reactive and showed an understanding of the transference in the analitic process; Ferenczi embraced the affections of the analyst as the possibility of unconscious communication and an intervening resource by establishing the notion of tact and empathy; Winnicott also supported the positivity of the affects from the therapist, providing tools for the use of the countertransference and the clinical management, grounding the analytic process in the transitional space, which allowed the creativity and originality in the therapeutic process. It was concluded that the possibility of to use the countertransference buy the therapist as a resource contributed the treatment of hard cases patients in private clinics, institutions and therapeutic accompaniment. The countertransference involves technical theoretical and ethical changes and articulates the aesthetic field, because it enhances the possibility of communication and understanding considering the emotional resources of the therapist in the care of hard cases patients.