The therapist does not treat patients by simply giving them another set of beliefs. He or she tries to help them see which kinds of ideas and beliefs have led to their suffering. Many patients want to get rid of their painful feelings, but they do not want to get rid of their beliefs, the viewpoints that are the very roots of their feelings.
Perfectionism is a self destructive and addictive belief system that fuels this primary thought: If I look perfect, and do everything perfectly, I can avoid or minimize the painful feelings of shame, judgment, and blame.