The fundamental assumption in humanistic-existential therapy is that the client has the freedom and responsibility to:

Control their own behavior

To facilitate healing, humanistic-existential therapy creates a permissive, non-judgmental, and accepting environment where clients can freely express their emotions and work towards achieving complexity, balance, and integration. The therapy is rooted in the belief that clients have the freedom and responsibility to control their own behavior, with the therapist serving as a facilitator and guide. The success of therapy ultimately lies in the client's hands.