Mental disorders are common and associated with severe impairments and high societal costs, thus representing a significant public health concern. About 75% of patients prefer psychotherapy over medication.1 For psychotherapy of mental disorders, several approaches are available such as cognitive behavioral therapy (CBT), interpersonal therapy, or psychodynamic therapy. Pointing to the available evidence, CBT is usually considered the gold standard for the psychotherapeutic treatment of many or even most mental disorders.2,3 For example, the American Psychological Association’s Division 12 Task Force on Psychological Interventions currently lists CBT as the only treatment with “strong research support” in almost 80% of all mental disorders included in its listing.2