An important task facing all clinicians, and especially challenging for younger, less experienced clinicians, is to come to know oneself sufficiently to be able to register the patient's experience in useful and progressively deeper ways. In an effort to aid younger clinicians in the daily struggle to "know thyself," Marilyn Charles turns to key ideas that have facilitated her own clinical work with difficult patients. Concepts such as "container" and "contained," transitional space, projective identification, and transference/countertransference are introduced not as academic ideas, but as aspects of the therapeutic environment that elicit greater creativity and vitality on the therapist's part. In Charles's skillful hands, the basic ideas of Klein, Winnicott, and Bion become newly comprehensible without losing depth and richness; they come to life in the fulcrum of daily clinical encounter.