A cornerstone ethical principle in the helping profession is helping the client while avoiding the risk of harm. Effective counseling and psychotherapy depend on the mental health professional's skills and competence to protect and serve clients. Competence refers to performing psychological activities according to appropriate techniques and criteria: knowledge, skill, and diligence. Striving for competence is a lifelong endeavor. Although mental health professionals may not intend to harm clients, incompetence often significantly contributes to harm. A mental health professional must be able to judge and be self-aware of their current skills and abilities to understand when they should refer their client(s) to another professional. They should always strive for a high level of competence in their professional life, which requires continuous education, including formal training and supervised practice, and the maintenance of existing knowledge. Mental health professionals must operate and practice within the limits of their competence.