Imagine walking through a beautiful park on a spring day. You’re happy, but then for some unknown reason a flicker of sadness ripples across your mind. It may be the result of hunger because you skipped lunch or perhaps you unwittingly triggered a troubling memory. After a few minutes you might start to feel a little down. As soon as you notice your lowered spirits you begin to probe yourself: It’s a lovely day. It’s a beautiful park. I wish I were feeling happier than I am now. Think about that for a moment: I wish I were feeling happier. How do you feel now? You probably feel worse. This is
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