Latch on to the affirmative. Bring gloom down to the minimum. Have faith or pandemonium. Is likely to walk in on the scene. In the 1980's research psychologist Martin Seligman says much the same.
Pessimism tends to create difficulties.
Much of this phenomenon seems to relate the way that individuals handle stress and problems. It is true that some of us have far more problems and far less advantages than others. And yet, some people seem to bounce back from difficulty easier than others. This doesn't change the reality of our difficulty, of course, but it does make it easier to cope with than if we considered ourselves fully at fault. In addition, when faced with difficulty, do we withdraw in defeat and helplessness or can we evaluate the situation and take control wherever feasible in order to improve it.