Dr. Albert Ellis is a psychotherapist and pioneer in the field of "cognitive restructuring." He designed his own therapy model and called it "Rational-Emotive Therapy" or RET. It aims at systematically and therapeutically changing maladaptive thinking patterns and deal with a wide variety of emotional problems. One of the major clinical tools of RET goes to unlearning certain core irrational ideas that are at the root of most emotional disturbances. Unconscious or not, these basic beliefs and attitudes a person holds do affect his or her feelings and behavior. Such then lead to depression and frustration. It is important to think through these irrational or maladaptive ideas carefully, to challenge them, and to replace them with rational, healthy beliefs.