" One of the things which offends us about radio and TV commercials is that it is often perfectly evident from the tone of voice that the announcer is “putting on,” playing a role, saying something he doesn’t feel. This is an example of incongruence. On the other hand each of us knows individuals whom we somehow trust because we sense that they are being what they are, that we are dealing with the person himself, not with a polite or professional front. It is this quality of congruence which we sense which research has found to be associated with successful therapy. The more genuine and congruent the therapist in the relationship, the more probability there is that change in personality in the client will occur. "

― Carl R. Rogers , On Becoming a Person: A Therapist's View of Psychotherapy