This chapter discusses some key findings from psychotherapy research concerning the relationship between the therapist and their clients, and provide a context for the presentation of the map of relational resonance. It discusses what therapists learn from their psychotherapy clients and how this affects their personal and professional lives, and what therapists bring into the therapy room from their own personal and private life experiences. In constructing the map of relational resonance, author has used the concept of power to understand the influence on clients from the family therapist's personal and private values and culture. The concept of the psychotherapy relationship as a type of power relationship is not mentioned in many handbooks and textbooks in the psychotherapy field. Reciprocal resonance covers therapeutic meetings where the client's history or situation recalls memories and emotions for the therapists that connect the therapist and the clients in a common way.