Instead of trying to find out what goes on inside a person’s head (“mentalism”), to know why people act as they do, Skinner suggested, all we need to know is what circumstances caused them to act in a certain way.

When the first force, social feeling and community expectation, is ignored or affronted, the person concerned will reveal certain aggressive character traits: vanity, ambition, envy, jealousy, playing God, or greed; or nonaggressive traits: withdrawal, anxiety, timidity, or absence of social graces. When any of these forces gains the upper hand, it is usually because of deep-seated feelings of inadequacy. Yet the forces also create an intensity or tension that can give tremendous energy.

A preference for extraversion (seeing life in terms of the external world) or introversion (greater interest in the inner world of ideas) is independent of your preferences for sensing, thinking, intuition, and feeling.

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This work led cognitive therapists such as Aaron Beck, David D. Burns, and Albert Ellis to build treatment around the idea that our thoughts shape our emotions, not the other way around. By changing our thinking, we can alleviate depression or simply have greater control over our behavior.

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Beck’s three principles of cognitive therapy were: All our emotions are generated by our “cognitions,” or thoughts. How we feel at any given moment is due to what we are thinking about. Depression is the constant thinking of negative thoughts. The majority of negative thoughts that cause us emotional turmoil are plain wrong or at least distortions of the truth, but we accept them without question.

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The ego develops a defense in order to protect itself against being overcome by unconscious demands such as sex and aggression. The work of the psychoanalyst is to get the person to become conscious of their instinctual urges, which may involve isolating the pain experienced when they were originally confronted by an unsatisfied impulse.